Pheromone, 3.Mitt.: Eine einfache Methode zur Steuerung der Reduktion von ?-Alkoxy-carbonylverbindungen
摘要:
Enantiomerically pure 1,2-diols bearing optionally syn or anti configurated secondary hydroxylic groups are synthesized from acetal-protected cyanohydrins. After resolution of the diastereomers the cyanohydrins are converted into alpha-alkoxy-ketones by Grignard-reaction followed by reduction using common chelating or non-chelating agents. Among others syntheses of enantiomerically pure pheromones, endo-Brevicomin, exo-Brevicomin and Dispalure are given as examples.
Cyano group transfer reaction of acetone cyanohydrin to various aldehydes in the presence of titanium alkoxide and aluminum alkyls to give the corresponding aldehyde cyanohydrins in high yield is described.
在钛烷氧化物和铝烷基物的存在下,丙酮氰醇对各种醛的氰基转移反应得以进行,高效地生成了相应的醛氰醇。
The first hydroxynitrile lyase catalysed cyanohydrin formation in ionic liquids
作者:Richard P. Gaisberger、Martin H. Fechter、Herfried Griengl
DOI:10.1016/j.tetasy.2004.06.028
日期:2004.9
Benzaldehyde, decanal, undecanal and dodecanal were reacted with hydrogen cyanide in a two phase solvent system aqueous buffer and ionic liquids (EMIMBF4)-B-., (PMIMBF4)-B-. and (BMIMBF4)-B-. in the presence of the hydroxynitrile lyases from Prunus amygdalus and Hevea brasiliensis. When compared to the use of organic solvents as the nonaqueous phase, the reaction rate was significantly increased whereas the enantioselectivity remained good. (C) 2004 Elsevier Ltd. All rights reserved.
MORI, ATSUNORI;KINOSHITA, KOICHI;OSAKA, MASAHIKO;INOUE, SHOHEI, CHEM. LETT.,(1990) N, C. 1171-1172