Facile preparation of difluoromethyl- and monofluoromethyl-containing amides via Ritter reaction
作者:Jun Liu、Chuanfa Ni、Ya Li、Laijun Zhang、Guanyu Wang、Jinbo Hu
DOI:10.1016/j.tetlet.2006.07.079
日期:2006.9
difluoromethylated acetamides in good yields, which is remarkably more efficient than the previously reported Ritter reactions with corresponding trifluoromethylated carbinols. Similarly, monofluoromethylated and (benzenesulfonyl)difluoromethylated carbinols have shown good reactivity in the Ritter reactions. Since the acetamides can be mildly deacetylated to give amines, the present methodology provides a convenient
发现仲和叔二氟甲基化甲醇在浓硫酸的催化下容易与乙腈反应,以良好的收率得到相应的二氟甲基化乙酰胺,这比先前报道的与相应的三氟甲基化甲醇的Ritter反应明显更有效。类似地,单氟甲基化的和(苯磺酰基)二氟甲基化的甲醇在Ritter反应中显示出良好的反应性。由于乙酰胺可以被轻度地脱乙酰基而得到胺,因此本方法学为从简单的羰基化合物开始同时合成含二氟甲基和单氟甲基的胺提供了一种方便的方法。