A novel and convenient route to cyclic and acyclic carbonates from unprotected methyl d-glycosides
作者:Monique Allainmat、Daniel Plusquellec
DOI:10.1016/0040-4039(91)85076-h
日期:1991.6
Unprotected methyl D-glycosides were selectively acylated by using thiazolidine-2-thione and 2-mercapto-5-methyl-1,3,4-thiadiazole alkoxycarbonyl or carbonyl derivatives. Under suitable conditions the corresponding 6-O-alkoxycarbonyl compounds or the cyclic Five or six membered carbonates could be obtained.
Acylations of free glycosylamines 1-3 using 3-acyl(or alkoxycarbonyl)-5-methyl-1,3,4-thiadiazole-2(3H)-thiones 5 and 2-acylthio-5-methyl-1,3,4-thiadiazoles 6 as acylating reagents, provided high yields of N-acyl-glycosylamines, whereas reactions with 3-acyl-thiazolidine-2-thiones 4 caused drastic deglycosylations.