Oxazaborolidine-Catalyzed Enantioselective Reduction of α-Methylene Ketones to Allylic Alcohols
摘要:
Oxazaborolidine-catalyzed enantioselective reduction of a-methylene ketones was efficiently carried out by using borane-diethylaniline as a stoichiometric reducing agent. The combination of this method and subsequent hydrogenation of thus-formed allylic alcohol improved stereoselectivity in the reduction of 24-oxocholesteryl ester to 24-(R)-hydroxycholesteryl ester.
Oxazaborolidine-Catalyzed Enantioselective Reduction of α-Methylene Ketones to Allylic Alcohols
摘要:
Oxazaborolidine-catalyzed enantioselective reduction of a-methylene ketones was efficiently carried out by using borane-diethylaniline as a stoichiometric reducing agent. The combination of this method and subsequent hydrogenation of thus-formed allylic alcohol improved stereoselectivity in the reduction of 24-oxocholesteryl ester to 24-(R)-hydroxycholesteryl ester.
An efficient synthesis of α,β-unsaturated ketones based on reaction of alkenylcopper(1)reagents with selenoesters (or acylchlorides) has been elaborated.
已经详细阐述了基于链烯基铜(1)试剂与硒酸酯(或酰氯)反应的α,β-不饱和酮的有效合成方法。
Insetion d'allenes
作者:J.L Roustan、A Guinot、P Cadiot
DOI:10.1016/s0022-328x(00)96194-1
日期:1980.8
ketones are generated in moderate yields (50–60%) from allene or a mono-, di- or tri-substitutedallenic hydrocarbon, n alkyl halide and sodium tetracarbonylferrate. The first step is the formation of a complex anion which results from transfer of the alkyl group on a coordinated CO, then of the acyl ligand thus formed on the allenic sp carbon. Protonation with acetic acid yields a hydroxy-η4-trimethylenemethane
.ALPHA.,.BETA.-Epoxy sulfoxides as useful intermediates in organic synthesis. 26. Ring-opening fluorination of .ALPHA.,.BETA.-epoxy sulfoxides: A novel synthesis of .ALPHA.-fluoroketones.
Selenoesters in organic synthesis. 2. New synthesis of saturated and ?,?-unsaturated ketones and the synthesis of the Peach moth pheromone (Carposia niponensis)
作者:A. F. Sviridov、M. S. Ermolenko、D. V. Yashunskii、N. K. Kochetkov
DOI:10.1007/bf00950160
日期:1985.7
Watanabe,S. et al., Australian Journal of Chemistry, 1977, vol. 30, p. 427 - 431