Synthesis of enantiomerically pure α-hydroxyaldehydes from the corresponding α-hydroxycarboxylic acids: novel substrates for Escherichia coli transketolase
We herein report a general, practical, and highly efficient method for asymmetricsynthesis of a wide range of chiral vicinal diamines via reductive coupling of imines templated by chiral diboron. The protocol features high enantioselectivity and stereospecificity, mild reaction conditions, simple operating procedures, use of readily available starting materials, and a broad substrate scope. The method
Highly Efficient Asymmetric Esterification of Cyclic meso-Dicarboxylic Anhydrides Catalyzed by Diphenylboryl Triflate
作者:Masahiro Ohshima、Teruaki Mukaiyama
DOI:10.1246/cl.1987.377
日期:1987.2.5
In the presence of a catalytic amount of diphenylboryl triflate, cyclic meso-dicarboxylic anhydrides are esterified by diphenylboric ester of (R)-2-methoxy-1-phenylethanol in a highly stereoselective manner, and, after the treatment with diazomethane, the chiral diesters are obtained with high diastereomeric excess.
MATTHEWS, BARRY R.;, JACKSON W. ROY;JACOBS, HOWARD A.;WATSON, KEITH G., AUSTRAL. J. CHEM., 43,(1990) N, C. 1195-214
作者:MATTHEWS, BARRY R.、, JACKSON W. ROY、JACOBS, HOWARD A.、WATSON, KEITH G.
DOI:——
日期:——
Matthews, Barry R.; Jackson, W. Roy; Jacobs, Howard A., Australian Journal of Chemistry, 1990, vol. 43, # 7, p. 1195 - 1214
作者:Matthews, Barry R.、Jackson, W. Roy、Jacobs, Howard A.、Watson, Keith G.
DOI:——
日期:——
Synthesis of enantiomerically pure α-hydroxyaldehydes from the corresponding α-hydroxycarboxylic acids: novel substrates for Escherichia coli transketolase
作者:Andrew J. Humphrey、Nicholas J. Turner、Raymond McCague、Stephen J. C. Taylor
DOI:10.1039/c39950002475
日期:——
Enantiomerically pure (R)-α-hydroxyaldehydes (>95% ee) are prepared from the corresponding α-hydroxyesters by silyl protection, reduction with diisobutylaluminium hydride, and finally deprotection under acidic conditions; subsequent coupling of these aldehydes with lithium hydroxypyruvate, catalysed by Escherichia coli transketolase, leads to novel optically pure triols.