Highly efficient chiral resolution and determination of absolute configuration of 2-alkanols by using a cyclopenta[b]furan derivative
摘要:
The reaction of 3a-benzhydryi-3,3a,4,5-tetrahydro-2H-cyclopenta[hjfuran and various 2-alkanols in the presence of a catalytic amount of pyridinium 4-tolunesulfonate in dichlorornethane gave 3a-benzhydryl-6a-(1-methyl-aloxy)-hexahydrocyclopenta[b]furan in more than 90% chemical yields. The resulting diastereomeric mixture is easily separable on silica gel chromatography because of the large DeltaR(f) value (briefly 0.1). Absolute configuration of the 2-alkanols can be easily estimated by the chemical shifts of H-1 and C-13 NMR of methyne group of the benzhydryl moiety. (C) 2003 Elsevier Ltd. All rights reserved.
Highly efficient chiral resolution and determination of absolute configuration of 2-alkanols by using a cyclopenta[b]furan derivative
摘要:
The reaction of 3a-benzhydryi-3,3a,4,5-tetrahydro-2H-cyclopenta[hjfuran and various 2-alkanols in the presence of a catalytic amount of pyridinium 4-tolunesulfonate in dichlorornethane gave 3a-benzhydryl-6a-(1-methyl-aloxy)-hexahydrocyclopenta[b]furan in more than 90% chemical yields. The resulting diastereomeric mixture is easily separable on silica gel chromatography because of the large DeltaR(f) value (briefly 0.1). Absolute configuration of the 2-alkanols can be easily estimated by the chemical shifts of H-1 and C-13 NMR of methyne group of the benzhydryl moiety. (C) 2003 Elsevier Ltd. All rights reserved.
The reaction of 3a-benzhydryi-3,3a,4,5-tetrahydro-2H-cyclopenta[hjfuran and various 2-alkanols in the presence of a catalytic amount of pyridinium 4-tolunesulfonate in dichlorornethane gave 3a-benzhydryl-6a-(1-methyl-aloxy)-hexahydrocyclopenta[b]furan in more than 90% chemical yields. The resulting diastereomeric mixture is easily separable on silica gel chromatography because of the large DeltaR(f) value (briefly 0.1). Absolute configuration of the 2-alkanols can be easily estimated by the chemical shifts of H-1 and C-13 NMR of methyne group of the benzhydryl moiety. (C) 2003 Elsevier Ltd. All rights reserved.