A rhodium-catalyzed enantioselective formal [4 + 3]-cycloaddition of vinylindoles with vinyldiazoacetates has been developed, affording the dearomative cyclization products containing a newly formed seven-membered ring in up to 99% ee. Rh2(S-DOSP)4 has been proven to be the best catalyst for the cycloaddition of 3-vinylindoles with vinyldiazoacetates, whereas Rh2(S-TCPTTL)4 has enhanced the enantioselectivity for 2-vinylindoles.
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Xu et al. (2018) studied this question.
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