4.8 Article

Asymmetric Transfer Hydrogenation of N-Unprotected Indoles with Ammonia Borane

Journal

ORGANIC LETTERS
Volume 22, Issue 15, Pages 5850-5854

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acs.orglett.0c01930

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Funding

  1. National Natural Science Foundation of China [91856103, 21521002, 21825108]

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A metal-free asymmetric transfer hydrogenation of unprotected indoles was successfully realized using a catalyst derived from HB(C6F5)(2) and (S)-tert-butylsulfinamide with ammonia borane as a hydrogen source. A variety of indolines were achieved in 40-78% yields with up to 90% ee.

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