A study of asymmetric hydrocyanation of heteroaryl carboxaldehydes catalyzed by (R)-oxynitrilase under micro-aqueous conditions
作者:Peiran Chen、Shiqing Han、Guoqiang Lin、Hao Huang、Zuyi Li
DOI:10.1016/s0957-4166(02)00005-8
日期:2001.12
A number of new optically active heteroaryl cyanohydrins have been prepared by hydrocyanation under micro-aqueous conditions catalyzed by almond meal (containing (R)-oxynitrilase). Substituent effects on the reaction are discussed. This micro-aqueous method provides an efficient, convenient and economical approach to optically active cyanohydrins. (C) 2002 Published by Elsevier Science Ltd.
Matthews, Barry R.; Jackson, W. Roy; Jayatilake, Gamini S., Australian Journal of Chemistry, 1988, vol. 41, # 11, p. 1697 - 1710
作者:Matthews, Barry R.、Jackson, W. Roy、Jayatilake, Gamini S.、Wilshire, Colin、Jacobs, Howard A.
DOI:——
日期:——
A Practical High Through-Put Continuous Process for the Synthesis of Chiral Cyanohydrins
作者:Peiran Chen、Shiqing Han、Guoqiang Lin、Zuyi Li
DOI:10.1021/jo020432n
日期:2002.11.1
A practical high through-put continuous process for the synthesis of chiral cyanohydrins is reported. Pretreated almond meal (or other solid raw enzyme sources) was loaded in a column to form a reactor, to which were attached a supplying system to deliver a solution of substrate and HCN in solvent on one end and a collecting-separating system on the other end. By controlling the flowing rate, optimal conditions were achieved for the hydrocyanation of various aromatic carboxaldehydes in a "micro-aqueous" medium to produce chiral cyanohydrins in high yields and high enantiomeric excess (ee) with high substrate/catalyst ratio.
Synthesis of Optically Active Cyanohydrins Using Almond Meal
作者:P. Zandbergen、J. van der Linden、J. Brussee、A. van der Gen
DOI:10.1080/00397919108021286
日期:1991.6
Abstract Asymmetric hydrocyanation of aldehydes was accomplished using almond meal, containing the enzyme oxynitrilase. Opticallyactivecyanohydrins with high levels of enantiomeric purity were obtained following a simple procedure.
Enantiomerically pure tetrahydroisoquinolines by enzyme catalysis and gold-catalyzed phenol synthesis
作者:A. Stephen K. Hashmi、Filiz Ata、Patrick Haufe、Frank Rominger
DOI:10.1016/j.tet.2008.12.058
日期:2009.2
Five different furfural derivatives were converted to chiral cyanohydrins by enzyme catalysis in good enantiomeric excess. After a sequence of silyl protection, nitrile reduction, tosylation and propargylation, substrates for the gold(I) catalyzed cycloisomerization of δ-alkynyl furans delivered good yields of enantiomerically pure dihydroxytetrahydroisoquinoline building blocks. Neither racemization