作者:Gary M. Coppola、Robert E. Damon、Harvey Yu
DOI:10.1002/jhet.5570330328
日期:1996.5
yields. These are further transformed to other tetrasubstituted thiophenes. The second method assembles the thiophene ring from three components: a benzyl mercaptan, an aldehyde, and a vinylphosphonate 10. Thus, the benzyl mercaptan is dilithiated then reacted with an appropriate aldehyde to afford a 2-mercapto-2-phenylethanol derivative 37. Michael addition of 37 to 10 followed by oxidation of the hydroxyl
通过两种方法制备高度官能化的噻吩。第一种方法是在三取代的5-溴噻吩25上进行锂-卤素交换反应,生成相应的5-硫代噻吩26,然后使其与二甲基甲酰胺或甲醛反应,以高收率得到5-甲酰基28或5-羟甲基噻吩衍生物31。将它们进一步转化为其他四取代的噻吩。第二种方法由三个组分组装噻吩环:苄硫醇,醛和乙烯基膦酸酯10。因此,使苄硫醇二锂化,然后与适当的醛反应,得到2-巯基-2-苯基乙醇衍生物37。迈克尔加成37至10,然后氧化羟基,得到酮膦酸酯39。分子内维蒂希型反应产生噻吩骨架。