One‐Pot Sequential Propargylation/Cycloisomerization: A Facile [4+2]‐Benzannulation Approach to Carbazoles |
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| Authors: | Dr Chada Raji?Reddy Reddi Rani?Valleti Uredi Dilipkumar |
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| Institution: | Division of Natural Products Chemistry, CSIR-Indian Institute of Chemical Technology, Hyderabad, India |
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| Abstract: | A novel one‐pot 4+2]‐benzannulation approach to substituted carbazoles is accomplished by acid‐catalyzed C3‐propargylation of 2‐alkenyl/aryl indoles with 1‐aryl propargylic alcohols, followed by cycloisomerization. A variety of 2‐alkenylated indoles and 2‐aryl/heteroaryl indoles successfully participated in this tandem reaction with 1‐aryl/heteroaryl propargylic alcohols to provide diversely substituted and annulated carbazoles, as well as an aza5]helicene. |
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| Keywords: | benzannulation carbazoles cycloisomerization metal-free synthesis propargylation |
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