Volume 54, Issue 22 pp. 6595-6599
Communication

Rhodium(III)-Catalyzed [3+2]/[5+2] Annulation of 4-Aryl 1,2,3-Triazoles with Internal Alkynes through Dual C(sp2)H Functionalization

Yuan Yang

Yuan Yang

State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082 (China)

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Ming-Bo Zhou

Ming-Bo Zhou

State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082 (China)

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Xuan-Hui Ouyang

Xuan-Hui Ouyang

State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082 (China)

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Rui Pi

Rui Pi

State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082 (China)

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Dr. Ren-Jie Song

Dr. Ren-Jie Song

State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082 (China)

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Prof. Dr. Jin-Heng Li

Corresponding Author

Prof. Dr. Jin-Heng Li

State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082 (China)

State Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou 730000 (China)

State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082 (China)Search for more papers by this author
First published: 14 April 2015
Citations: 140

We thank the Natural Science Foundation of China (Nos. 21472039 and 21172060) and Hunan Provincial Natural Science Foundation of China (No. 13JJ2018) for financial support.

Graphical Abstract

A quantum leap in complexity: A general strategy based on rhodium(III) azavinyl carbene intermediates was established for the oxidative [3+2]/[5+2] annulation of 4-aryl 1-tosyl-1,2,3-triazoles with alkynes. This general method provided densely functionalized indeno[1,7-cd]azepine architectures with excellent selectivity through the functionalization of two C(sp2)H bonds (see scheme; Cp*=pentamethylcyclopentadienyl, Ts= p-toluenesulfonyl).

Abstract

A rhodium(III)-catalyzed [3+2]/[5+2] annulation of 4-aryl 1-tosyl-1,2,3-triazoles with internal alkynes is presented. This transformation provides straightforward access to indeno[1,7-cd]azepine architectures through a sequence involving the formation of a rhodium(III) azavinyl carbene, dual C(sp2)H functionalization, and [3+2]/[5+2] annulation.

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