Asymmetric Transfer Hydrogenation of N-Unprotected Indoles with Ammonia Borane
2020
Zhao, Weiwei | Zhang, Zijia | Feng, Xiangqing | Yang, Jing | Du, Haifeng
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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