The allyl ether as a protecting group in carbohydrate chemistry. Part III. The but-2-enyl ether group
作者:Patricia A. Gent、Roy Gigg、R. Conant
DOI:10.1039/p19720001535
日期:——
2,4,6-Tri-O-benzyl-D-galactopyranose was prepared from allyl 3-O-allyl-2,4,6-tri-O-benzyl-α-D-galactopyranoside for use in the synthesis of oligosaccharides containing a galactose residue substituted on the 3-position. The use of the but-2-enyl (crotyl) ether system for the protection of hydroxy-groups was investigated. The but-2-enyl ethers were stable to mild acid hydrolysis and to the basic conditions
-2,4,6-三ö苄基d -galactopyranose由烯丙基3-制备ø -烯丙基-2,4,6-三ö苄基α- d -galactopyranoside用于寡糖合成使用含有在3位上取代的半乳糖残基。研究了丁-2-烯基(巴豆基)醚体系用于保护羟基的用途。丁-2-烯基醚对于温和的酸水解和苄基化所需的基本条件均稳定,并易于在叔丁醇钾的二甲基亚砜中裂解。由烯丙基2,4,6-三-O-苄基-3- O制备丙-1-烯基2,4,6-三-O-苄基-α- D-吡喃半乳糖苷-丁-2-烯基- α- d -galactopyranoside和丙-1-烯基2-苯甲酰氨基-4,6-二ø -苄基-2-脱氧β- d吡喃葡萄糖苷,从烯丙基2-苯甲酰氨基4制备,6-二-O-苄基-3- O-丁-2-烯基-2-脱氧-β - D-吡喃葡萄糖苷。由相应的β-烯丙基糖苷制备2-苯甲酰胺基-3,4,6-三-O-苄基-2-脱氧-D-葡萄糖-和D-半乳糖-吡喃糖。