2-(Prenyloxymethyl)benzoyl (POMB) as a new temporary protecting group for alcohols
作者:Jean-Michel Vatèle
DOI:10.1016/j.tetlet.2005.02.008
日期:2005.3
The 2-(prenyloxymethyl)benzoyl (POMB) group was introduced in high yields to hydroxyl functions using the crystalline reagent, 2-(prenyloxymethyl)benzoic acid, in the presence of dicyclohexylcarbodiimide (DCC) and 4-dimethylaminopyridine (DMAP). 2-(Prenyloxymethyl)benzoic acid is readily available, in two steps, from phthalide in 65% overall yield. The POMB group can be cleaved, in two steps, by treatment
在二环己基碳二亚胺(DCC)和4-二甲基氨基吡啶(DMAP)的存在下,使用结晶试剂2-(异戊氧基甲基)苯甲酸将2-(异戊氧基甲基)苯甲酰基(POMB)高产率地引入羟基官能团。分两步从邻苯二甲酸酯中容易地获得2-(苯甲氧基甲基)苯甲酸,总产率为65%。通过用2,3-二氯-5,6-二氰基醌(DDQ)处理,然后通过催化量的Yb(OTf)3 ·H诱导的所得羟基酯分子内酯化,可通过两个步骤裂解POMB基团2个O的反应条件是与多个保护基如异亚丙基,苄基,乙酰基,氯乙酰基,苯甲酰基,乙酰丙酰基,Fmoc基和Boc基团的存在不兼容。