On the preparation of disymmetrized tris(hydroxymethyl) methanol equivalents
摘要:
Synthetic equivalents, 1,1-bis-hydroxymethyl methylene oxides 7, 18, of trisubstituted carbinol derivatives such as the disymmetrized tetrahedral tris(hydroxymethyl) methanol 17 have been obtained in enantiomerically pure form from (R)-methyl-p-tolylsulfoxide, glycolic acid ethyl ester and diazomethane.
On the preparation of disymmetrized tris(hydroxymethyl) methanol equivalents
摘要:
Synthetic equivalents, 1,1-bis-hydroxymethyl methylene oxides 7, 18, of trisubstituted carbinol derivatives such as the disymmetrized tetrahedral tris(hydroxymethyl) methanol 17 have been obtained in enantiomerically pure form from (R)-methyl-p-tolylsulfoxide, glycolic acid ethyl ester and diazomethane.
Highlyefficient, direct, and enantioselectivesynthesis of useful chiral building blocks with excellent ee was performed by the catalytic asymmetric acylation of meso-1,3-propanediols. A structurally most simple meso-1,3-propanediol, 2-methyl-1,3-propanediol, was asymmetrized in 96% ee catalyzed by 0.5 mol% of chiral 1,2-diamine.
通过内消旋 1,3-丙二醇的催化不对称酰化,高效、直接和对映选择性合成具有优异 ee 的有用手性结构单元。结构上最简单的内消旋-1,3-丙二醇,即 2-甲基-1,3-丙二醇,在 0.5 mol% 的手性 1,2-二胺催化下,其 ee 不对称化率为 96%。