Asymmetric intramolecular Cannizzaro reaction of anhydrous phenylglyoxal
摘要:
The use of anhydrous phenylglyoxal provides a solution to the problem of low reactivity in the asymmetric intramolecular Cannizzaro reaction with alcohols. Double asymmetric induction was achieved in the reaction of anhydrous phenylglyoxal with D-(+)-menthol promoted by a (SS)-t-BuBox center dot copper(II) hexafluoroantimonate complex. (C) 2008 Elsevier B.V. All rights reserved.
Highly diastereoselective reduction of (−) menthylphenylglyoxalate and (−) menthylpyruvate using new hindered lithiumtrialkoxyaluminohydrides
作者:G. Boireau、A. Deberly
DOI:10.1016/s0957-4166(00)80456-5
日期:1991.1
Reduction of the keto group of (-)menthylphenylglyoxalate and (-)menthyl pyruvate can be achieved with high diastereoisomeric excess (80-90%) using newly synthesized hindered lithium trialkoxyaluminium hydrides in THF at -78-degrees-C. Hindered borohydrides such as lithium trisiamylborohydride reduce those ketoesters with a lower diastereoselectivity.