Decarboxylative Trichloromethylation of Aromatic Aldehydes and Its Applications in Continuous Flow
作者:Andreas B. Jensen、Anders T. Lindhardt
DOI:10.1021/jo402595r
日期:2014.2.7
Two new protocols for the efficient synthesis of 2,2,2-trichloromethylcarbinols, starting from aromatic aldehydes, have been developed. A combination of sodium trichloroacetate in the presence of malonic acid proved efficient for the transformation of electron deficient aldehydes using DMSO as solvent. Electron-rich aldehydes did, however, not require the addition of malonic acid, affording the desired
从芳族醛开始,已经开发了两种用于有效合成2,2,2-三氯甲基甲醇的新方案。在丙二酸存在下,三氯乙酸钠的组合被证明对于使用DMSO作为溶剂的电子缺陷醛的转化有效。然而,富含电子的醛不需要添加丙二酸,提供了所需的2,2,2-三氯甲基甲醇,而没有竞争性的坎尼扎罗反应痕迹。最后,三氯乙酸钠在THF中的反应与醛和丙二酸溶于DMSO的混合物反应,可以连续进行操作。通过以连续流动进行该脱羧反应,可以通过简单且安全的设置实现反应的放大。在此流程设置中,