Diastereoselective synthesis of chiral 2,2,4-trisubstituted 1,3-dioxanes.
作者:Hiroshi SUEMUNE、Naoki TANAKA、Kiyoshi SAKAI
DOI:10.1248/cpb.38.3155
日期:——
Diastereoselective acetalization of methyl pyruvate and methyl phenylformate with (R)-1, 3-butanediol afforded predominantly (2R, 4R)-2-methoxycarbonyl-2, 4-dimethyl (or 4-methyl-2-phenyl)-1, 3-dioxanes (1a, 4a) under thermodynamically controlled conditions. The (2S, 4R)-isomer (1b) was obtained as the major product under kinetically controlled conditions.
在热力学控制条件下,甲基丙酮酸酯和甲基苯甲酸酯与 (R)-1, 3-丁二醇的二面体选择性缩醛反应主要生成 (2R, 4R)-2-甲氧羧基-2, 4-二甲基 (或 4-甲基-2-苯基)-1, 3-二氧烷 (1a, 4a)。在动力学控制条件下,获得 (2S, 4R)-异构体 (1b) 为主要产物。