作者:Norbert Debski、Wolfgang Hanefeld、Martin Schlitzer
DOI:10.1002/jhet.5570340509
日期:1997.9
An improved method for the reaction of 2,4-dichlorothiazole-5-carbaldehyde (2) with secondary amines was established using potassium carbonate in acetonitrile at room temperature instead of deprotonation with butyllithium in tetrahydrofuran at −78°. The method is convenient and the yields of 3 even higher. Compound 2 could also be reacted by this method with thiophenols to yield 4-chloro-2-phenylt
在室温下,使用碳酸钾在乙腈中,而不是在-78°C下,用丁基锂在四氢呋喃中进行去质子反应,建立了一种改进的2,4-二氯噻唑-5-甲醛(2)与仲胺反应的方法。该方法方便,并且3的产率甚至更高。化合物2也可以通过该方法与硫酚反应,得到4-氯-2-苯基硫代噻唑-5-甲醛4。