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Chiral Borate Esters in Asymmetric Synthesis. Part 5. Asymmetric Reduction of Oxime Ethers Promoted by Chiral Spiroborate Esters with an O3BN Framework.

✍ Scribed by Yunbo Chu; Zixing Shan; Dejun Liu; Nannan Sun

Publisher: John Wiley and Sons
Year: 2006
Weight: 22 KB
Volume: 37
Category: Article
ISSN: 0931-7597
DOI: 10.1002/chin.200640062

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✦ Synopsis

Abstract

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Chiral Borate Esters in Asymmetric Synthesis. Part 2 : Asymmetric Borane Reduction of Prochiral Ketones in the Presence of a Chiral Spiroborate Ester

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## Abstract Asymmetric catalytic activity of the chiral spiroborate esters **1**–**9** with a O~3~BN framework (see __Fig. 1__) toward borane reduction of prochiral ketones was examined. In the presence of 0.1 equiv. of a chiral spiroborate ester, prochiral ketones were reduced by 0.6 equiv. of bor