作者:Yukio Takahashi、Tomoya Ogawa
DOI:10.1016/0008-6215(87)80136-2
日期:1987.7
Abstract Described for the first time is a total synthesis of cyclomalthoexaose, in 0.3% overall yield, in 21 steps starting from maltose. Maltose was transformed into allyl O -(2,3,6-tri- O -benzyl-α- d -glucopyranosyl)-(1→4)-2,3,6-tri- O -benzyl-β- d -glucopyranoside ( 5 ) and O -(4- O -acetyl-2,3,6-tri- O -benzyl-α- d -glucopyranosyl)-(1→4)-2,3,6-tri- O -benzyl-β- d -glucopyranosyl fluoride ( 6
摘要首次描述了从麦芽糖开始的21步总产率为0.3%的全环麦芽索糖的全合成。麦芽糖被转化为烯丙基O-(2,3,6-三-O-苄基-α-d-吡喃葡萄糖基)-(1→4)-2,3,6-三-O-苄基-β-d-吡喃葡萄糖苷(5)和O-(4-O-乙酰基-2,3,6-三-O-苄基-α-d-吡喃葡萄糖基)-(1→4)-2,3,6-三-O-苄基- β-d-吡喃葡萄糖基氟(6)。化合物5与化合物6的糖基化以及产物的部分脱保护得到烯丙基O-(2,3,6-三-O-苄基-α-d-吡喃葡萄糖基)-(1→4)-双[O-(2 ,(3,6-三-O-苄基-gad-吡喃葡萄糖基)-(1→4)]-2,3,6-三-O-苄基-β-d-吡喃葡萄糖苷,进一步被糖基糖基化供体6,并转化为关键中间体O-(2,3,6,-三-O-苄基-α-d-吡喃吡喃糖基)-(1→4)-四[[O-(2,3,6,-三-O-苄基-α-d-吡喃葡萄糖基)-(1→4)]-2