On the synthesis of vinyl and phenyl C-furanosides by stereospecific debenzylative cycloetherification
作者:Riccardo Cribiù、K. Eszter Borbas、Ian Cumpstey
DOI:10.1016/j.tet.2009.01.014
日期:2009.3
diastereoselectivity of addition is dependent on whether a Grignard reagent or a trialkylzincate reagent is used. The open-chain compounds undergo a stereospecific cyclisation reaction on treatment with catalytic strong Brønsted acid with heating to form tetrahydrofurans with inversion of configuration at the allylic or benzylic carbon (C-1) and loss of hydroxyl from this position. A short synthesis
通过将有机金属乙烯基或苯基试剂加到苄基醚保护的碳水化合物半缩醛中,合成其中一种醇为烯丙基或苄基的开链苄基醚保护的多元醇。加成的非对映选择性取决于是否使用格氏试剂或三烷基锌酸酯试剂。该开链化合物在用催化强布朗斯台德酸处理并加热形成四氢呋喃后,经历立体定向环化反应,形成四氢呋喃,其烯丙基或苄基碳(C-1)的构型反转,并且从该位置失去羟基。起始原料的合成短,1,2,4,6 -四- ö苄基d半乳糖,乳糖进行说明。