Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 55, Issue 48, Pages 15142-15146Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201608918
Keywords
alkynyl imines; arylation; Bronsted acids; Friedel-Crafts reaction; propargylamines
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Funding
- NSFC [21372193, 21362040, 21672184]
- Program for Changjiang Scholars and Innovative Research Team in University [IRT13095]
- Government of Yunnan Province [2013FA026]
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The first arylation strategy for the synthesis of enantioenriched propargylamines is disclosed. This approach, which is complementary to previous alkynylation and alkylation strategies, involves a C(sp(2))-C(sp(3)) bond formation, and is based on the first asymmetric Friedel-Crafts-type arylation reaction of C-alkynyl imines. Asymmetric Friedel-Crafts reactions with electron-deficient phenols, a longstanding unsolved challenge, have thus been realized for the first time, enabled by the combination of our recently introduced C-alkynyl N-Boc-protected N,O-acetals as electrophiles and chiral phosphoric acids as catalysts. The synthetic utility of the resulting structurally diverse and polyfunctional chiral propargylamines was demonstrated by a series of selective transformations, including controlled reduction of the alkynyl group and iterative cross-couplings.
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