作者:Takeshi Shimizu、Tadashi Nakata、Katsuya Hiramoto
DOI:10.1055/s-2001-14564
日期:——
The efficient succinylation of the sterically hindered tertiary alcohols 1 was performed by reaction with succinic acid monomethyl and monoallyl ester (4a and 4b), respectively, in CH2Cl2 in the presence of dicyclohexylcarbodiimide and 4-(dimethylamino)pyridine under high pressure to give the methyl and allyl succinates 5a and 5b, respectively, in high yields. The succinates 5a,b were efficiently converted into the hemisuccinate 3a by treatment with lithium propyl mercaptide or by palladium(0)-catalyzed deallylation.
高效的对位阻的
三级醇1的
琥珀酸酯化反应是通过在存在二环己基碳二
亚胺和4-(
二甲氨基)
吡啶的情况下,在高压下与
琥珀酸单甲酯和单烯
丙酯(4a和4b)分别在
二氯甲烷中反应进行的,从而高产率地得到甲基和烯丙基
琥珀酸酯5a和5b。
琥珀酸酯5a和5b可以通过与丙基巯基
锂处理或通过
钯(0)催化的去烯丙基化反应高效转化为半
琥珀酸酯3a。