Indium(III)-catalyzed asymmetric alkynylation of aryl, heteroaryl, alkyl and alkenyl aldehydes with 2-methyl-3-butyn-2-ol as an ethyne equivalent donor was realized, and products were obtained in moderate to good yields (up to 97%) and high enantioselectivities (up to 99% ee) using 2–10 mol% of catalyst.
Enantioselective Addition of 2-Methyl-3-butyn-2-ol to Aldehydes: Preparation of 3-Hydroxy-1-butynes
作者:D. Boyall、F. López、H. Sasaki、D. Frantz、E. M. Carreira
DOI:10.1021/ol006791r
日期:2000.12.1
We report the first example of enantioselective aldehyde additions of 2-methyl-3-butyn-2-ol, a commodity bulk chemical that is readily available. Following a facile fragmentation reaction, the addition reactions provide access to optically active terminal acetylenes as useful building blocks for asymmetric synthesis.