Synthesis of substituted 2,7-dioxabicyclo[4.1.0]heptanes: 1,2-anhydro-3,4,6-tri-O-benzyl- and 1,2-anhydro-3,4,6-tri-O-(p-bromobenzyl)-α-d-galactopyranose
作者:Fanzuo Kong、Jingying Du、Heng Shang
DOI:10.1016/0008-6215(87)80217-3
日期:1987.5
1,2-blocked d -galactopyranose ethers, the 1,2-hydroxyl groups were protected with an ethylidene group instead of a 1-ethoxyethylidene group. The key intermediates for the synthesis were 2- O -acetyl-3,4,6-tri- O -benzyl- and 2- O -acetyl-3,4,6-tri- O -( p -bromobenzyl)-β- d -galactopyranosyl fluoride that were prepared from the corresponding, substituted α- d -galactopyranosyl chlorides with silver
摘要由d-半乳糖经9个步骤合成了标题化合物。为了获得稳定的1,2-嵌段的d-吡喃半乳糖醚,用亚乙基而不是1-乙氧基亚乙基保护1,2-羟基。合成的关键中间体是2-O-乙酰基-3,4,6-三-O-苄基和2-O-乙酰基-3,4,6-三-O-(对溴苄基)-β- d-吡喃半乳糖基氟是由相应的,被氟化银取代的α-d-吡喃半乳糖基氯制备的。用叔丁醇钾在环戊烷中回流下定量测定β-d-吡喃半乳糖基氟的闭环,得到结晶的目标化合物。合成中涉及的大多数反应容易以高产率进行。