Univocal syntheses of 2- and 3-hydroxymethyl-2,3-dihydro[1,4]dioxino[2,3-b]pyridine enantiomers
作者:Cristiano Bolchi、Marco Pallavicini、Laura Fumagalli、Barbara Moroni、Chiara Rusconi、Ermanno Valoti
DOI:10.1016/j.tetasy.2005.09.003
日期:2005.10
(R)-2 were obtained from (R)- and (S)-isopropylideneglycerol, respectively. The novel efficient synthetic strategies, which do not follow routes already reported for the corresponding racemates, ensure very high regioselectivity and maintenance of the enantiomeric purity of the starting materials. The enantiomeric composition of the title compounds was determined by chiral HPLC or NMR. The key intermediate
合成了2-和3-羟甲基取代的2,3-二氢[1,4]二恶英[2,3- b ]吡啶1和2的对映异构体,它们是制备几种生物活性化合物的重要手性结构单元。(S)-和(R)-1是从苄基甘油的一种或两种对映体获得的,而(S)-和(R)-2是从(R)-和(S)获得的)-异亚丙基甘油。新颖的有效合成策略不遵循已报道的相应外消旋物的路线,可确保非常高的区域选择性并维持原料的对映体纯度。通过手性HPLC或NMR确定标题化合物的对映体组成。合成非外消旋1的关键中间体,即1-苄基-2-甲磺酰基-3-三苯甲基甘油,是一种新型的高熔点手性C 3合成子,值得考虑其稳定性,多功能性,易于通过简单的结晶分离以及,通过简单的一锅反应序列进行构型转化的潜力。