Additional Nucleophile-Free FeCl<sub>3</sub>-Catalyzed Green Deprotection of 2,4-Dimethoxyphenylmethyl-Protected Alcohols and Carboxylic Acids
作者:Yoshinari Sawama、Masahiro Masuda、Akie Honda、Hiroki Yokoyama、Kwihwan Park、Naoki Yasukawa、Yasunari Monguchi、Hironao Sajiki
DOI:10.1248/cpb.c16-00161
日期:——
mother alcohols and carboxylic acids in excellent yields. Since the present deprotection proceeds via the self-assembling mechanism of the 2,4-DMPM protective group itself to give the hardly-soluble resorcinarene derivative as a precipitate, the rigorous purification process by silica-gel column chromatography was unnecessary and the sufficiently-pure alcohols and carboxylic acids were easily obtained
甲氧基苯基甲基(MPM)醚和酯衍生物的脱保护通常可以通过催化路易斯酸和化学计量亲核试剂的组合使用来实现。发现2,4-二甲氧基苯基甲基(DMPM)保护的醇和羧酸的脱保护可被氯化铁(III)有效地催化,而无需任何其他亲核试剂以优异的产率形成脱保护的母醇和羧酸。由于本脱保护反应是通过2,4-DMPM保护基自身的自组装机理进行的,从而得到了难溶的间苯二甲烯衍生物,为沉淀物,因此不需要通过硅胶柱色谱法进行严格的纯化,而且需要足够的纯度。简单过滤后,很容易以令人满意的收率获得醇和羧酸。