(2,6-Dichloro-4-alkoxyphenyl)-(2,4-dichlorophenyl)methyl Trichloroacetimidates: Protection of Alcohols and Carboxylic Acids in Solution or on Polymer Support
作者:Michio Kurosu、Kai Li
DOI:10.1055/s-0029-1216974
日期:2009.11
(10˜100 mol%) to react with alcohols and carboxylic acids. Under these conditions a wide variety of alcohols can be transformed into the corresponding ethers in excellent yields with a slight excess of the trichloroacetimidate. The resulting ethers are not susceptible to typical deprotection conditions for benzyl and 4-methoxybenzyl ether groups, however, they can be conveniently deprotected by treatment
(2,6-二氯-4-甲氧基苯基)-(2,4-二氯苯基)-甲基三氯乙酰亚胺酸酯可以被TMSOTf(10〜100mol%)有效地活化以与醇和羧酸反应。在这些条件下,各种醇可以以极高的收率转化为相应的醚,而三氯乙酰亚氨酸酯略有过量。所得的醚对于典型的苄基和4-甲氧基苄基醚基的脱保护条件不敏感,但是,它们可以通过用在二氯甲烷中的30〜50%三氟乙酸处理而方便地脱保护。聚合物结合的(2,6-二氯-4-烷氧基苯基)-(2,4-二氯苯基)甲基三氯乙酰亚胺酸酯可用于固定醇和羧酸。 保护基-醇和羧酸-二苯甲基酯衍生物-聚合物键合-接头