Regioselective benzoylations of glycopyranosylamines: Synthesis of partially protected glycopyranosyl isothiocyanates
作者:José Fuentes Mota、José Manuel Garcia Fernandez、Carmen Ortiz Mellet、María Angeles Pradera Adrian、Reyes Babiano Caballero
DOI:10.1016/0008-6215(89)84056-x
日期:1989.6
Abstract Regioselective benzoylations of N -(2,2-diethoxycarbonylvinyl)-β- d -galactopyranosylamine ( 1 ) yielded 2,3,6-tri- O - ( 3 ) and 3,6-di- O -benzoyl- N -(2,2-diethoxycarbonylvinyl)-β- d -galactopyranosylamine ( 4 ), whereas, from the β- d - gluco analogue 5 , the 2,3,6-tri- ( 7 ), 3,6-di- ( 8 ), and 2,6-di- O -benzoyl ( 9 ) derivatives were obtained together with the fully esterified compounds
摘要N-(2,2-二乙氧基羰基乙烯基)-β-d-吡喃半乳糖苷胺(1)的区域选择性苯甲酰化生成2,3,6-tri-O-(3)和3,6-di-O-苯甲酰基-N-( 2,2-二乙氧基羰基乙烯基)-β-d-吡喃半乳糖胺(4),而在β-d-葡萄糖类似物5中,2,3,6-tri-(7),3,6-di-(8)和2,6-二-O-苯甲酰基(9)衍生物与完全酯化的化合物(2和6)一起获得。用溴处理3,用氯处理7,得到2,3,6-三-O-苯甲酰基-β-d-甘露型核糖胺氢卤化物(分别为10和11),其与硫光气反应生成2,3,6-三-O-苯甲酰基-β-d-吡喃半乳糖异硫氰酸酯(12)和β-d-葡萄糖类似物14。3,