<i>N</i>-Thioacyl 1,3-Amino Alcohols: Synthesis via Ring-Opening of Oxiranes with Thioamide Dianions and Applications as Key Intermediates Leading to Stereochemically Defined 5,6-Dihydro-4<i>H</i>-1,3-oxazines and 1,3-Amino Alcohols
作者:Toshiaki Murai、Hiroaki Sano、Hiroyasu Kawai、Hideo Aso、Fumitoshi Shibahara
DOI:10.1021/jo051378o
日期:2005.9.1
anti-N-thioacyl 1,3-amino alcohols, and cis-5,6-dihydro-4H-1,3-oxazines were obtained with high efficiency, whereas the reaction of a syn-alcohol gave a thioimidate as a major product. The reduction of N-thioacyl 1,3-amino alcohols with LiAlH4 gave N-alkyl 1,3-amino alcohols in high yields. The use of optically active propylene oxide as a starting material gave the corresponding oxazine and alcohols in optically
N-硫代酰基1,3-氨基醇通过氧杂环戊烷与由N-苄基硫代酰胺和BuLi生成的硫代酰胺二阴离子以高度区域选择性和立体选择性的方式开环合成。N-硫代酰基1,3-氨基醇的非对映异构体易于通过柱色谱法分离,得到立体化学定义的N-硫代酰基1,3-氨基醇。他们用Bu 4 NF和EtI进行分子内环化,得到5,6-二氢-4 H -1,3-恶嗪。该反应是特异性的与抗- ñ -thioacyl 1,3-氨基醇,以及顺式- 5,6-二氢-4- ħ高效地获得了-1,3-恶嗪,而合成醇的反应产生了以硫代亚氨酸盐为主要产物。用LiAlH 4还原N-硫代酰基1,3-氨基醇以高收率得到N-烷基1,3-氨基醇。使用光学活性的环氧丙烷作为原料,以光学纯的形式得到了相应的恶嗪和醇。