A New Approach to the Synthesis of 2-Aryl-4-halomethyl-5-methyl-1,3-oxazoles by Highly Regioselective Direct Halogenation with NBS or NCS/MeCN
作者:Taihei Yamane、Hiroyuki Mitsudera、Takatsugu Shundoh
DOI:10.1055/s-2004-834862
日期:——
A simple and efficient method for the synthesis of 2-aryl-4-bromomethyl-5-methyl-1,3-oxazoles 2 and 2-aryl-4-chloromethyl-5-methyl-1,3-oxazoles 3 is described. The reaction of 2-aryl-4,5-dimethyl-1,3-oxazoles 1 with N-bromosuccinimide and N-chlorosuccinimide in acetonitrile under mild conditions provides 4-halomethyl isomers with exceptionally high regioselectivity in moderate to good yields.
描述了一种简单高效的合成2-芳基-4-溴甲基-5-甲基-1,3-噁唑2和2-芳基-4-氯甲基-5-甲基-1,3-噁唑3的方法。在温和条件下,2-芳基-4,5-二甲基-1,3-噁唑1与N-溴代琥珀酰亚胺和N-氯代琥珀酰亚胺在乙腈中反应,以中等至良好的收率提供了具有极高区域选择性的4-卤甲基异构体。