Glycosylthiomethyl Chloride: A New Species for <i>S</i>-Neoglycoconjugate Synthesis. Synthesis of 1-<i>N</i>-Glycosylthiomethyl-1,2,3-triazoles
作者:Xiangming Zhu、Richard R. Schmidt
DOI:10.1021/jo035300o
日期:2004.2.1
Reaction of O-acyl-protected glycosylthiols with dichloromethane afforded readily glycosylthiomethyl chlorides, which gave with sodium azide the corresponding glycosylthiomethyl azides 17-22. Reaction of these azides with dicyclopentadiene as dipolarophile led to tandem 1,3-dipolar cycloaddition/retro-Diels-Alder reaction furnishing the parent 1-glycosylthiomethyl-1,2,3-triazoles 23-25. Reaction of azides with acetylene derivatives gave directly 1-glycosylthiomethyl-1,2,3-triazoles which are ring-substituted.
Synthesis of Novel <i>S</i>-Neoglycopeptides from Glycosylthiomethyl Derivatives
作者:Xiangming Zhu、Kandasamy Pachamuthu、Richard R. Schmidt
DOI:10.1021/ol036186z
日期:2004.4.1
Reaction of glycosylthiomethyl azides with amino acid and peptide derivatives containing aspartate and glutamate thio acids gave the corresponding glycosylthiomethyl amides in excellent yields. Another type of neoglycopeptides was obtained via reaction of glycosylthiomethyl bromide with cysteine and homocysteine containing peptide derivatives, thus affording the corresponding S-(glycosylthiomethyl) peptides.