Asymmetric Reduction of Diynones and the Total Synthesis of (S)-Panaxjapyne A
摘要:
The asymmetric transfer hydrogenation of a series of diynones has been achieved in high conversion and enantiomeric induction. When R-1 is a phenyl group, a competing alkyne reduction takes place; however, when R-1 is an alkyl group, this side-reaction is not observed. The application of the reduction to the total synthesis of the natural product (S)-panaxjapyne A in high enantiomeric excess is described.
Kinetic Resolution of Propargylic Alcohols Catalyzed by Benzotetramisole
作者:Vladimir B. Birman、Lei Guo
DOI:10.1021/ol061906y
日期:2006.10.1
[reaction: see text] Kineticresolution of variously substituted secondary propargylic alcoholscatalyzed by benzotetramisole (BTM) proceeds with selectivity factors up to 32, the highest ever achieved with nonenzymatic catalysts for this class of substrates.