作者:Christophe Audouard、John Fawcett、Gerry A. Griffiths、Jonathan M. Percy、St�phane Pintat、Clive A. Smith
DOI:10.1039/b313731g
日期:——
direct sequence involving ring-closing metathesis and indium-mediated difluoroallylation with 1-bromo-1,1-difluoropropene in water. Two protecting group strategies were explored, one to allow protection of the primary C-6 hydroxyl group throughout the sequence, while the second was intended to allow deprotection after RCM and before dihydroxylation. The benzyl ether could be used in the first role, and
4-脱氧-4,4-二氟糖苷已通过直接序列首次合成,该序列涉及闭环复分解和铟介导的1-溴-1,1-二氟丙烯在水中的二氟烯丙基化。探索了两种保护基策略,一种允许在整个序列中保护伯C-6羟基,而第二种旨在允许在RCM之后和二羟基化之前进行脱保护。苄基醚可以在第一个角色中使用,新戊酰在第二个角色中是有效的。二羟基化是高度立体选择性的,并受糖苷酸CO键的方向控制。