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Journal articles on the topic 'C-H Activation and Domino Cyclization'

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Author: Grafiati

Published: 6 September 2023

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1

Park, Sunhwa, Kye Jung Shin, and Jae Hong Seo. "Total Synthesis of Cyclopiamide A Using Palladium-Catalyzed Domino Cyclization." Molecules 25, no. 21 (October 23, 2020): 4903. http://dx.doi.org/10.3390/molecules25214903.

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Total synthesis of cyclopiamide A was accomplished using a palladium-catalyzed domino cyclization. Three rings in the tetracyclic skeleton of cyclopiamide A were constructed in a one-step domino reaction incorporating double carbopalladation and C-H activation.

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2

Tran, Duc N., and Nicolai Cramer. "Highly Selective Rhodium Catalyzed Domino C–H Activation/Cyclizations." CHIMIA International Journal for Chemistry 65, no. 4 (April 27, 2011): 271–73. http://dx.doi.org/10.2533/chimia.2011.271.

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3

Szalóki Vargáné, Dóra, László Tóth, Balázs Buglyó, Attila Kiss-Szikszai, Attila Mándi, Péter Mátyus, Sándor Antus, et al. "[1,5]-Hydride Shift-Cyclization versus C(sp2)-H Functionalization in the Knoevenagel-Cyclization Domino Reactions of 1,4- and 1,5-Benzoxazepines." Molecules 25, no. 6 (March 11, 2020): 1265. http://dx.doi.org/10.3390/molecules25061265.

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Domino cyclization reactions of N-aryl-1,4- and 1,5-benzoxazepine derivatives involving [1,5]-hydride shift or C(sp2)-H functionalization were investigated. Neuroprotective and acetylcholinesterase activities of the products were studied. Domino Knoevenagel-[1,5]-hydride shift-cyclization reaction of N-aryl-1,4-benzoxazepine derivatives with 1,3-dicarbonyl reagents having active methylene group afforded the 1,2,8,9-tetrahydro-7bH-quinolino [1,2-d][1,4]benzoxazepine scaffold with different substitution pattern. The C(sp3)-H activation step of the tertiary amine moiety occurred with complete regioselectivity and the 6-endo cyclization took place in a complete diastereoselective manner. In two cases, the enantiomers of the chiral condensed new 1,4-benzoxazepine systems were separated by chiral HPLC, HPLC-ECD spectra were recorded, and absolute configurations were determined by time-dependent density functional theory- electronic circular dichroism (TDDFT-ECD) calculations. In contrast, the analogue reaction of the regioisomeric N-aryl-1,5-benzoxazepine derivative did not follow the above mechanism but instead the Knoevenagel intermediate reacted in an SEAr reaction [C(sp2)-H functionalization] resulting in a condensed acridane derivative. The AChE inhibitory assays of the new derivatives revealed that the acridane derivative had a 6.98 μM IC50 value.

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4

Jeon, Woo Hyung, Jeong-Yu Son, Ji Eun Kim, and Phil Ho Lee. "Synthesis of 1,2-Benzothiazines by a Rhodium-Catalyzed Domino C–H Activation/Cyclization/Elimination Process from S-Aryl Sulfoximines and Pyridotriazoles." Organic Letters 18, no. 14 (July 7, 2016): 3498–501. http://dx.doi.org/10.1021/acs.orglett.6b01750.

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5

Ramesh, Karu, and Gedu Satyanarayana. "A Domino Palladium-Catalyzed Cyclization: One-Pot Synthesis of 4b-Alkyl-10-phenyl-4b,5-dihydroindeno[2,1-a]indenes via Carbopalladation Followed by C–H Activation." Journal of Organic Chemistry 82, no. 8 (April 10, 2017): 4254–64. http://dx.doi.org/10.1021/acs.joc.7b00254.

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6

Wan, Jie-Ping, Yi Li, and Yunyun Liu. "Annulation based on 8-aminoquinoline assisted C–H activation: an emerging tool in N-heterocycle construction." Organic Chemistry Frontiers 3, no. 6 (2016): 768–72. http://dx.doi.org/10.1039/c6qo00077k.

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As an important emerging area of 8-aminoquinoline assisted C–H activation, the construction of heterocycles via direct C–H activation and domino reactions involving domino C–H activation/annulation has been highlighted.

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7

Cheng, Jiang, Xiaopeng Wu, Song Sun, and Jin-Tao Yu. "Recent Applications of α-Carbonyl Sulfoxonium Ylides in Rhodium- and Iridium-Catalyzed C–H Functionalizations." Synlett 30, no. 01 (September 5, 2018): 21–29. http://dx.doi.org/10.1055/s-0037-1610263.

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Sulfoxonium ylides are a special type of sulfur ylides that serve as new C1 or C2 synthons recently developed for use in C–H functionalization to access acylmethylated or cyclized compounds through the formation of metal carbene species. Many excellent works have reported the syntheses of various useful skeletons from these versatile synthons. These developments have not previously been completely investigated or reviewed. In this review, we summarize recent advances in the use of α-carbonyl sulfoxonium ylides in C–H functionalizations, including ortho-C–H acylmethylation reactions and ortho-C–H activation/cyclization reactions. Table of Contents 1 Introduction2 Ortho-C–H Acylmethylation Reactions3 Ortho-C–H Activation/Cyclization Reactions3.1 Ortho-C–H Activation/Cyclization of Anilines and Enamines3.2 Ortho-C–H Activation/Cyclization of Azobenzenes3.3 Ortho-C–H Activation/Cyclization of N-Methoxybenzamide3.4 Ortho-C–H Activation/Cyclization of Imines3.5 Ortho-C–H Activation/Cyclization of N-Azoloimines3.6 Ortho-C–H Activation/Cyclization of Benzoylacetonitriles3.7 Ortho-C–H Activation/Cyclization of Benzoyl Sulfoxonium Ylides4 Conclusion

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8

Lotz, Florian, Klaus Kahle, Mehrnoush Kangani, Soundararasu Senthilkumar, and Lutz F. Tietze. "Domino C-H Activation Reactions through Proximity Effects." European Journal of Organic Chemistry 2018, no. 40 (October 9, 2018): 5562–69. http://dx.doi.org/10.1002/ejoc.201801289.

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9

Cramer, N., and D. Tran. "Rhodium-Catalyzed Domino C-H Activation-Intramolecular Allylation of Imines." Synfacts 2011, no. 01 (December 21, 2010): 0065. http://dx.doi.org/10.1055/s-0030-1259167.

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10

Ahmad, Muhammad Siddique, Po-Han Lin, Qing Zhang, Bing Zeng, Qifeng Wang, and Kamel Meguellati. "Visible Light Induced C-H/N-H and C-X Bonds Reactions." Reactions 4, no. 1 (March 2, 2023): 189–230. http://dx.doi.org/10.3390/reactions4010012.

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Herein, we report efficient visible light-induced photoredox reactions of C–H/N–H and C–X Bonds. These methods have provided access to varied portfolio of synthetically important γ-ketoesters, azaspirocyclic cyclohexadienones spirocyclohexadienones, multisubstituted benzimidazole derivatives, substituted N,2-diarylacetamide, 2-arylpyridines and 2-arylquinolines in good yields and under mild conditions. Moreover, we have successfully discussed the construction through visible light-induction by an intermolecular radical addition, dearomative cyclization, aryl migration and desulfonylation. Similarly, we also spotlight the visible light-catalyzed aerobic C–N bond activation from well-known building blocks through cyclization, elimination and aromatization. The potential use of a wide portfolio of simple ketones and available primary amines has made this transformation very attractive.

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11

Yang, Wei, Jingyi Wang, He Wang, Lei Li, Yuekai Guan, Xianxiu Xu, and Dayu Yu. "Rhodium(iii)-catalyzed three-component cascade synthesis of 6H-benzo[c]chromenes through C–H activation." Organic & Biomolecular Chemistry 16, no. 38 (2018): 6865–69. http://dx.doi.org/10.1039/c8ob01938j.

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12

Qian, Peng, Linna Xu, Wenyan Wang, Lin Zhang, Liang Tang, Jiaojiao Liu, and Liangquan Sheng. "Electrochemical synthesis of dipyrazolo/dipyrimidine-fused pyridines via oxidative domino cyclization of C(sp³)–H bonds." Organic Chemistry Frontiers 9, no. 6 (2022): 1662–67. http://dx.doi.org/10.1039/d1qo01641e.

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An electrochemically oxidative domino cyclization reaction of methyl azaarenes/ketones with pyrazol-5-amines and 6-amino-pyrimidine-2,4-diones was developed, providing a variety of dipyrazolo/dipyrimidine-fused pyridines with moderate to good yields.

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13

Furuta, Takumi, Tomohiro Asakawa, Mie Iinuma, Satoshi Fujii, Kiyoshi Tanaka, and Toshiyuki Kan. "Domino Heck–C–H activation reaction of unsymmetrically substituted [3]cumulene." Chem. Commun., no. 34 (2006): 3648–50. http://dx.doi.org/10.1039/b607684j.

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14

Cui, Yuxin, Yanxing Jia, and Zhiyao Lu. "Palladium-Catalyzed Domino Heck/C-H Activation/Intermolecular Direct Arylation Reactions." Synthesis 2011, no. 16 (May 26, 2011): 2595–99. http://dx.doi.org/10.1055/s-0030-1260603.

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15

Liu, Jiaqi, Xuan Zhou, Chenglong Wang, Wanyong Fu, Wenyi Chu, and Zhizhong Sun. "Total synthesis of protosappanin A and its derivatives via palladium catalyzed ortho C–H activation/C–C cyclization under microwave irradiation." Chemical Communications 52, no. 29 (2016): 5152–55. http://dx.doi.org/10.1039/c6cc01149g.

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Protosappanin A, a complex natural product with high bioactivity, and 25 of its derivatives were synthesized through an intramolecular ortho C–H activation/C–C cyclization, ring-enlargement and deprotection reaction. C–H activation as the key step was investigated and optimized.

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16

Santhoshkumar, Rajagopal, and Chien-Hong Cheng. "Hydroarylations by cobalt-catalyzed C–H activation." Beilstein Journal of Organic Chemistry 14 (August 29, 2018): 2266–88. http://dx.doi.org/10.3762/bjoc.14.202.

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As an earth-abundant first-row transition metal, cobalt catalysts offer a broad range of economical methods for organic transformations via C–H activation. One of the transformations is the addition of C–H to C–X multiple bonds to afford alkylation, alkenation, amidation, and cyclization products using low- or high-valent cobalt catalysts. This hydroarylation is an efficient approach to build new C–C bonds in a 100% atom-economical manner. In this review, the recent developments of Co-catalyzed hydroarylation reactions and their mechanistic studies are summarized.

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17

Swamy, T., B. Maheshwar Rao, J. S. Yadav, V. Ravinder, B. Sridhar, and B. V. Subba Reddy. "Microwave-assisted, ruthenium-catalyzed intramolecular amide-alkyne annulation for the rapid synthesis of fused tricyclic isoquinolinones." RSC Advances 5, no. 84 (2015): 68510–14. http://dx.doi.org/10.1039/c5ra11133a.

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18

Mao, Jiangang, Shuo-Qing Zhang, Bing-Feng Shi, and Weiliang Bao. "Palladium(0)-catalyzed cyclopropanation of benzyl bromides via C(sp3)–H bond activation." Chem. Commun. 50, no. 28 (2014): 3692–94. http://dx.doi.org/10.1039/c3cc49231a.

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19

Li, Mingliang, and Fuk Yee Kwong. "Cobalt‐Catalyzed Tandem C−H Activation/C−C Cleavage/C−H Cyclization of Aromatic Amides with Alkylidenecyclopropanes." Angewandte Chemie 130, no. 22 (April 14, 2018): 6622–26. http://dx.doi.org/10.1002/ange.201801706.

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20

Li, Mingliang, and Fuk Yee Kwong. "Cobalt‐Catalyzed Tandem C−H Activation/C−C Cleavage/C−H Cyclization of Aromatic Amides with Alkylidenecyclopropanes." Angewandte Chemie International Edition 57, no. 22 (May 28, 2018): 6512–16. http://dx.doi.org/10.1002/anie.201801706.

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21

Yu, Binxun, Tuo Jiang, Junpeng Li, Yingpeng Su, Xinfu Pan, and Xuegong She. "A Novel Prins Cyclization through Benzylic/Allylic C−H Activation." Organic Letters 11, no. 15 (August 6, 2009): 3442–45. http://dx.doi.org/10.1021/ol901291w.

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22

Ma, Chen, Huanhuan Liu, and Xinfeng Wang. "Synthesis of Imidazo[1,5-a]quinolines via Metal-Free Oxidative Amination of sp3 C–H Bonds." Synthesis 50, no. 14 (May 29, 2018): 2761–67. http://dx.doi.org/10.1055/s-0037-1610137.

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A novel oxidative amination of sp3 C–H bonds was developed for the efficient synthesis of imidazo[1,5-a]quinolines from readily available α-amino acids and (2-azaaryl)methanes. This domino protocol, which was established in a TBAI-TBHP oxidation system, includes transition-metal-free decarboxylation and intramolecular cyclization. This method represented a new avenue for the synthesis of N-heterocycles using 2-methylquinolines as the synthon of quinoline-2-carbaldehydes.

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23

Vivek Kumar, Sundaravel, Sonbidya Banerjee, and Tharmalingam Punniyamurthy. "Rh-Catalyzed C–C/C–N bond formation via C–H activation: synthesis of 2H-indazol-2-yl-benzo[a]carbazoles." Organic Chemistry Frontiers 6, no. 23 (2019): 3885–90. http://dx.doi.org/10.1039/c9qo01120j.

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Rh-Catalyzed site-selective C–H activation and ring opening/cyclization of 7-azabenzonorbornadienes with aryl-2H-indazoles is developed to furnish indazolyl-benzocarbazole frameworks. Substrate scope and mechanistic studies are important practical features.

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24

Zhou, Xuan, Wanyong Fu, Hongshuo Jiang, Chenglong Wang, Chao Ju, Wenyi Chu, and Zhizhong Sun. "Synthesis of 8-azaprotosappanin A derivatives via intramolecular palladium-catalyzed ortho C–H activation/C–C cyclization and their antibacterial activity." Organic & Biomolecular Chemistry 15, no. 9 (2017): 1956–60. http://dx.doi.org/10.1039/c6ob02707e.

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25

Patel, Anuj, Mahommedumar Shaikh, and Kishor Chikhalia. "Palladium catalyzed domino C-H activation strategy: An access to 9- fluorenones." Tetrahedron 75, no. 2 (January 2019): 236–45. http://dx.doi.org/10.1016/j.tet.2018.11.055.

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26

Saha, Nemai, Haiwen Wang, Shengyi Zhang, Yongliang Du, Daqian Zhu, Yumin Hu, Peng Huang, and Shijun Wen. "Domino Carbopalladation/C–H Activation as a Quick Access to Polycyclic Frameworks." Organic Letters 20, no. 3 (January 10, 2018): 712–15. http://dx.doi.org/10.1021/acs.orglett.7b03843.

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27

Oonishi, Yoshihiro, Yoshihiro Sato, Shunki Sakamoto, and Shuya Agata. "Rhodium(I)-Catalyzed Enantioselective Cyclization of Enynes through Site-Selective C(sp3)–H Bond Activation Triggered by Formation of Rhodacycle." Synthesis 53, no. 17 (March 30, 2021): 2976–83. http://dx.doi.org/10.1055/a-1469-7408.

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AbstractRhodium(I)-catalyzed enantioselective cyclization of enynes through C(sp3)–H bond activation was investigated. It was found that the cyclization of enynes having a tert-butyl moiety on the alkene afforded a spirocyclic compound (up to 92% ee), while the cyclization of enynes having an isopropyl or an ethyl group on the alkene gave a cyclic diene (up to 98% ee). Furthermore, an intermolecular competition reaction using a deuterium-labeled substrate revealed that C(sp3)–H bond activation was one of the key steps, having a high energy barrier, in this cyclization.

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28

Sun, Qiao, and Naohiko Yoshikai. "Cobalt-Catalyzed Tandem Radical Cyclization/C–C Coupling Initiated by Directed C–H Activation." Organic Letters 21, no. 13 (June 20, 2019): 5238–42. http://dx.doi.org/10.1021/acs.orglett.9b01846.

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29

Kim, Hyun Jin, David C. Fabry, Steffen Mader, and Magnus Rueping. "Photoredox/rhodium catalysis in C–H activation for the synthesis of nitrogen containing heterocycles." Organic Chemistry Frontiers 6, no. 14 (2019): 2319–23. http://dx.doi.org/10.1039/c9qo00206e.

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30

Wang, Siqi, Erfei Miao, Hao Wang, Bichao Song, Wei Huang, and Weibo Yang. "Rh-Catalyzed cascade C–H activation/C–C cleavage/cyclization of carboxylic acids with cyclopropanols." Chemical Communications 57, no. 48 (2021): 5929–32. http://dx.doi.org/10.1039/d1cc01778k.

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31

Sun, Mingjie, Xinyang Chen, Zichao Feng, Guobo Deng, Yuan Yang, and Yun Liang. "A Catellani and retro-Diels–Alder strategy to access 1-amino phenanthrenes via ortho- and interannular C–H activation of 2-iodobiphenyls." Organic Chemistry Frontiers 8, no. 23 (2021): 6535–40. http://dx.doi.org/10.1039/d1qo01103k.

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32

Park, Youngchul, Incheol Jeon, Seohyun Shin, Jiae Min, and Phil Ho Lee. "Ruthenium-Catalyzed C–H Activation/Cyclization for the Synthesis of Phosphaisocoumarins." Journal of Organic Chemistry 78, no. 20 (September 26, 2013): 10209–20. http://dx.doi.org/10.1021/jo401608v.

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33

Huang, Ji-Rong, Liu Qin, Yu-Qin Zhu, Qiang Song, and Lin Dong. "Multi-site cyclization via initial C–H activation using a rhodium(iii) catalyst: rapid assembly of frameworks containing indoles and indolines." Chemical Communications 51, no. 14 (2015): 2844–47. http://dx.doi.org/10.1039/c4cc07125e.

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Tandem multi-site cyclization triggered by Rh(iii)-catalyzed C–H activation has been achieved for highly efficient synthesis of spirocycle indolin-3-one (C2-cyclization), benzo[a]carbazole (C3-cyclization) and an unusual indoxyl core (N1-cyclization).

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34

Lu, Zhiyao, Yuxin Cui, and Yanxing Jia. "ChemInform Abstract: Palladium-Catalyzed Domino Heck/C-H Activation/Intermolecular Direct Arylation Reactions." ChemInform 42, no. 52 (December 1, 2011): no. http://dx.doi.org/10.1002/chin.201152144.

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35

Mao, Jiangang, and Weiliang Bao. "Palladium-catalyzed [2+1+1] annulation of norbornenes with (z)-bromostyrenes: synthesis of bismethylenecyclobutanes via twofold C(sp2)–H bond activation." Chem. Commun. 50, no. 99 (2014): 15726–29. http://dx.doi.org/10.1039/c4cc06545j.

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A Pd(0)-catalyzed domino bismethylenecyclobutanation reaction was established. The [2+1+1] cycloaddition involves twofold C(sp²)–H bond activation and formation of three carbon–carbon bonds.

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36

Zhou, Chun-Ni, Zi-Ang Zheng, George Chang, Yuan-Chao Xiao, Yang-Huan Shen, Gen Li, Yu-Min Zhang, Wang-Ming Peng, Liang Wang, and Biao Xiao. "Phosphorus-Containing Groups Assisted Transition Metal Catalyzed C-H Activation Reactions." Current Organic Chemistry 23, no. 2 (April 23, 2019): 103–35. http://dx.doi.org/10.2174/1385272823666190213113059.

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Over the last few decades, transition metal-catalyzed direct C-H activation with the assistance of a coordinating directing group has emerged as an atom- and stepeconomical synthetic tools to transform C–H bonds into carbon-carbon or carbonheteroatom bonds. Although the strategies involving regioselective C–H cleavage assisted by various directing groups have been extensively reviewed in the literature, we now attempt to give an overview of the recent advances on phosphorus-containing functional group assisted C-H activation reactions catalyzed by transition-metal catalysts including mechanistic study and synthetic applications. The discussion is directed towards C-H olefination, C-H activation/cyclization, C-H arylation, C-H amination, C-H hydroxylation and acetoxylation as well as miscellaneous C-H activation.

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37

Huang, Liang-Zhu, Rui-Yue Ma, Lu-Nan Zhou, Zhen-Ting Du, and Tao Zhang. "Syntheses of Benzo[c]Chromen-6-ones by Palladium Catalyzed C–H Bond Activation using Diazonium Salts." Natural Product Communications 12, no. 4 (April 2017): 1934578X1701200. http://dx.doi.org/10.1177/1934578x1701200419.

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An efficient palladium catalyzed C-H bond activation for the synthesis of benzo[ c]chromen-6-ones using diazonium salts is described. In the presence of Pd(OAc)2, dppp, PivOH and K2CO3, the diazonium salt can be transformed into the product through a denitrogenation/C-H bond activation/cyclization sequence in acetonitrile. Altogether, nine structurally diverse substituted benzo[ c]chromen-6-ones were prepared in excellent yields through two different methods.

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38

Hu, Yimin, Yuan Qu, Fenghua Wu, Jinghan Gui, Yun Wei, Qiong Hu, and Shaowu Wang. "Tuned CH Functionalization to Construct Aza-Podophyllotoxin/Aza-Conidendrin Derivatives by Means of Domino Cyclization." Chemistry - An Asian Journal 5, no. 2 (February 1, 2010): 309–14. http://dx.doi.org/10.1002/asia.200900307.

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39

Lyu, Hairong, Yangjian Quan, and Zuowei Xie. "Rhodium catalyzed cascade cyclization featuring B–H and C–H activation: one-step construction of carborane-fused N-polyheterocycles." Chemical Science 9, no. 30 (2018): 6390–94. http://dx.doi.org/10.1039/c8sc01568f.

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A novel Rh-catalyzed cascade cyclization featuring both carboranyl B–H and aryl C–H activation has been developed, resulting in the one-pot construction of three new B–C and C–C bonds. The isolation and structural identification of a key intermediate provide solid evidence for the reaction mechanism.

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40

Xiao, Bin, Tian-Jun Gong, Zhao-Jing Liu, Jing-Hui Liu, Dong-Fen Luo, Jun Xu, and Lei Liu. "Synthesis of Dibenzofurans via Palladium-Catalyzed Phenol-Directed C–H Activation/C–O Cyclization." Journal of the American Chemical Society 133, no. 24 (June 22, 2011): 9250–53. http://dx.doi.org/10.1021/ja203335u.

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41

Cindro, Nikola, Margareta Horvat, Kata Mlinarić-Majerski, Axel G. Griesbeck, and Nikola Basarić. "Photoinduced homolytic C–H activation in N-(4-homoadamantyl)phthalimide." Beilstein Journal of Organic Chemistry 7 (March 2, 2011): 270–77. http://dx.doi.org/10.3762/bjoc.7.36.

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N-(4-homoadamantyl)phthalimide (5) on excitation and population of the triplet excited state underwent intramolecular H-abstractions and gave products 6 and 7. The major product, exo-alcohol 6 was a result of the regioselective δ H-abstraction and the stereoselective cyclization of the 1,5-biradical. Minor products 7 were formed by photoinduced γ H-abstractions, followed by ring closure to azetidinols and ring enlargement to azepinediones. The observed selectivity to exo-alcohol 6 was explained by the conformation of 5 and the best orientation and the availability of the δ-H for the abstraction.

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42

Qian, Wenyuan, Hao Wang, and Jennifer Allen. "Copper-Catalyzed Domino Cycloaddition/CN Coupling/Cyclization/(CH Arylation): An Efficient Three-Component Synthesis of Nitrogen Polyheterocycles." Angewandte Chemie 125, no. 42 (September 5, 2013): 11198–202. http://dx.doi.org/10.1002/ange.201305970.

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43

Qian, Wenyuan, Hao Wang, and Jennifer Allen. "Copper-Catalyzed Domino Cycloaddition/CN Coupling/Cyclization/(CH Arylation): An Efficient Three-Component Synthesis of Nitrogen Polyheterocycles." Angewandte Chemie International Edition 52, no. 42 (September 6, 2013): 10992–96. http://dx.doi.org/10.1002/anie.201305970.

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44

Li, Xing Guang, Min Sun, Kai Liu, Qiao Jin, and Pei Nian Liu. "Rh(iii)-catalyzed C–H activation/cyclization of benzamides and diazo compounds to form isocoumarins and α-pyrones." Chemical Communications 51, no. 12 (2015): 2380–83. http://dx.doi.org/10.1039/c4cc09314c.

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45

Gogoi, Anupal, Anju Modi, Srimanta Guin, Saroj Kumar Rout, Debapratim Das, and Bhisma K. Patel. "A metal free domino synthesis of 3-aroylindoles via two sp3C–H activation." Chem. Commun. 50, no. 72 (2014): 10445–47. http://dx.doi.org/10.1039/c4cc04407j.

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46

Tsai, Andy S., Rebecca M. Wilson, Hitoshi Harada, Robert G. Bergman, and Jonathan A. Ellman. "Rhodium catalyzed enantioselective cyclization of substituted imidazoles via C–H bond activation." Chemical Communications, no. 26 (2009): 3910. http://dx.doi.org/10.1039/b902878a.

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47

Mitsui, Takashi, Yuichiro Tokoro, Ryosuke Haraguchi, Kengo Sugita, Masato Harada, Shin-ichi Fukuzawa, Yasunori Minami, and Tamejiro Hiyama. "Synthesis of Ferrocene-Fused Pyrans through Alkynoxy-Directed C–H Activation/Cyclization." Bulletin of the Chemical Society of Japan 91, no. 5 (May 15, 2018): 839–45. http://dx.doi.org/10.1246/bcsj.20170415.

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Gritsch, Philipp J., Christian Leitner, Magnus Pfaffenbach, and Tanja Gaich. "The Witkop Cyclization: A Photoinduced CH Activation of the Indole System." Angewandte Chemie International Edition 53, no. 5 (December 9, 2013): 1208–17. http://dx.doi.org/10.1002/anie.201307391.

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Yu, Binxun, Tuo Jiang, Junpeng Li, Yingpeng Su, Xinfu Pan, and Xuegong She. "ChemInform Abstract: A Novel Prins Cyclization Through Benzylic/Allylic C-H Activation." ChemInform 40, no. 48 (November 6, 2009): no. http://dx.doi.org/10.1002/chin.200948144.

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Jaiswal, Yogesh, Yogesh Kumar, Jagannath Pal, Ranga Subramanian, and Amit Kumar. "Rapid synthesis of polysubstituted phenanthridines from simple aliphatic/aromatic nitriles and iodo arenes via Pd(ii) catalyzed domino C–C/C–C/C–N bond formation." Chemical Communications 54, no. 52 (2018): 7207–10. http://dx.doi.org/10.1039/c8cc03556c.

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