作者:Henry W. Pauls、Allen Krantz
DOI:10.1055/s-1989-27148
日期:——
2-Acylmethylidene-3-methylthiazolines 3 (R = alkyl or aryl) are obtained from their precursor acids in one operation. Carboxylic acids 1 are activated with carbodiimide, and treated, in situ, in the presence of 4-dimethylaminopyridine, with 3-methyl-2-methylidene-4-thiazoline (6) (derived from thiazolium salt 2) to yield 2-acylmethylidene-3-methylthiazolines 3.
2-Acylmethylidene-3-methylthiazolines 3(R = 烷基或芳基)由其前体酸通过一次操作获得。羧酸 1 经碳化二亚胺活化,并在 4-二甲氨基吡啶存在下与 3-甲基-2-亚甲基-4-噻唑啉 (6) (从噻唑盐 2 中提取)原位处理,生成 2-酰亚甲基-3-甲基噻唑啉 3。