Optimisation of enantioselectivity for the chiral base-mediated rearrangement of bis-protected meso-4,5-dihydroxycyclohexene oxides: asymmetric synthesis of 4-deoxyconduritols and conduritol F
作者:Simon E de Sousa、Peter O'Brien、Christopher D Pilgram
DOI:10.1016/s0040-4020(02)00370-8
日期:2002.6
based on diastereoselective epoxidation of a cyclohexene followed by chiral lithium amide-mediated epoxide rearrangement has been used to synthesise an allylic alcoholbuildingblock of >95% ee. The key step is the enantioselective rearrangement of a bis-protected meso-4,5-dihydroxycyclohexene oxide. A range of protecting groups and chiral base structures were surveyed in order to find the optimum protocol
Transfer hydrogenation of representative aryl and heteroaryl dialkylaminomethyl ketones with formic acid-triethylamine, catalyzed by RuCl[(R,R)-TsDPEN](eta-p-cymene), produces the corresponding beta-dialkylamino alcohols, 97-99% ee, in 50-73% yields. Asymmetric synthesis of (R)-macromerine, 98% ee, the cactus Coryphantha macromeris alkaloid, is also described. (C) 2009 Elsevier Ltd. All rights reserved.
Yadav, Ashok K.; Manju, Meera, Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 2006, vol. 45, # 12, p. 2770 - 2772
作者:Yadav, Ashok K.、Manju, Meera
DOI:——
日期:——
Enantioselective synthesis of optically active β-aminoalcohols via asymmetric reduction
作者:Byung Tae Cho、Yu Sung Chun
DOI:10.1016/s0957-4166(00)80269-4
日期:1992.1
Optically active beta-aminoalcohol derivatives were prepared by asymmteric reduction of the corresponding aminoketones with a chiral borohydride, K glucoride (1).