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Asymmetric borane reduction of ketones promoted by menthopyrazole-zncl2 complex

✍ Scribed by Choji Kashima; Yoshihiro Tsukamoto; Yohei Miwa; Kohei Higashide

Publisher
Journal of Heterocyclic Chemistry
Year
2001
Tongue
English
Weight
52 KB
Volume
38
Category
Article
ISSN
0022-152X

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✦ Synopsis

Abstract

The enantioselective reduction of ketones was accomplished by borane in the presence of pyrazole derivatives, particularly 2‐methoxymethyl‐3‐phenyl‐1‐menthopyrazole (8). The catalysis of zinc chloride makes it possible to lower the reaction temperature below 0 °C, and to promote enantioselectivity.

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