作者:Yuan Ji、Jessica Sweeney、Jillian Zoglio、David J. Gorin
DOI:10.1021/jo401941v
日期:2013.11.15
Although methylation reactions are commonplace, currently used reagents are hazardous, toxic, and/or unstable. Dimethylcarbonate has been put forth as an inexpensive, nontoxic, and “green” potential methylating reagent. Herein we report a general, base-catalyzed methyl transfer from dimethylcarbonate to carboxylic acids. High selectivity for esterification is observed even in the presence of unprotected
尽管甲基化反应很普遍,但是当前使用的试剂是危险的,有毒的和/或不稳定的。碳酸二甲酯已被提出为廉价,无毒且“绿色”的潜在甲基化试剂。本文中,我们报道了一般的碱催化的甲基碳酸酯从碳酸二甲酯向羧酸的转移。即使在未保护的苯酚存在下,也观察到了对酯化的高选择性,温和的反应条件使在可差向立体中心处的立体化学得以保留。同位素标记研究表明,机制是通过将甲基直接从碳酸二甲酯转移到底物上来进行的。