作者:Daniel Cicero、Oscar Varela、Rosa M. De Lederkremer
DOI:10.1016/s0040-4020(01)86679-5
日期:1990.1
reagents. The thiol group at C-4 was introduced by nucleophilic substitution of a tosylate by thiocyanate followed by reduction or alkaline methanolysis of the thiocyano group. A by-product of the latter reaction was characterized as a monothiolcarbonate derivative (), whose conformation was studied by molecular mechanics calculations. Acetolysis of methyl 6-deoxy-4-thio-α--galactopyranoside () afforded
描述了由甲基α--吡喃葡萄糖苷()合成6-脱氧-4-硫代-半乳糖的吡喃类和呋喃类衍生物。合成的关键中间体甲基2,3-二-苯甲酰基-6-脱氧-4-硫代-α--吡喃半乳糖苷()的制备方法与制备方法不同。通过使用各种试剂来实现保护或修饰其或其衍生物的羟基的区域选择性。通过用硫氰酸酯亲和取代甲苯磺酸酯,然后通过还原或碱性甲醇分解硫氰基引入C-4上的硫醇基。后一反应的副产物表征为单硫代碳酸酯衍生物(),通过分子力学计算研究了其构象。乙酰化6-脱氧-4-硫代-α--吡喃半乳糖苷(),得到含环硫的6-脱氧-4-硫代-半乳糖呋喃糖衍生物。