作者:Seiji Yamaguchi、Masahide Kobayashi、Shin-ichiro Harada、Masahiro Miyazawa、Yoshiro Hirai
DOI:10.1246/bcsj.81.863
日期:2008.7.15
A new preparation of 2-(hydroxymethyl)chromones was developed via the new regio-selective six-membered cyclization of 1-[o-(tert-butyldimethylsiloxy)phenyl]but-2-yn-1-ones by a three-step treatment with 1) diethylamine (activation of the γ-position), 2) KF-18-crown-6 (deprotection), and 3) silica-gel (cyclization). A naturally occurring chiral hydroxymethylfurochromone, (−)-umtatin, was synthesized starting from chiral (R)-(−)-2-isopropenyl-4,6-dimethoxy-2,3-dihydrobenzofuran, and the absolute structure was determined to R.
一种新的 2-(羟甲基)香豆素的制备方法是通过对 1-[o-(叔丁基二甲基硅氧烷)苯基]丁-2-炔-1-酮进行三步处理实现的新区域选择性六元环化,步骤包括:1) 二乙胺(激活 γ 位),2) KF-18-冠-6(去保护),3) 硅胶(环化)。一种天然存在的手性羟甲基呋喃香豆素 (−)-umtatin 是从手性 (R)-(−)-2-异丙烯基-4,6-二甲氧基-2,3-二氢苯呋喃合成的,绝对结构确定为 R。