The key intermediate to 3,3-difluoroalanine, 2,2-difluoro-1-ethylthioethylamine hydrobromide (2), was prepared by the Steglich and Weygand procedure. Its conversion to N-benzyloxycarbonyl-2,2-difluoro-1-ethenylethylamine (5) followed by oxidation and subsequent deprotection of the amine afforded the 3,3-difluoroalanine.
3,3-二氟丙氨酸的关键中间体 2,2-二
氟-1-乙
硫基
乙胺氢溴酸盐 (2) 是通过 Steglich 和 Weygand 程序制备的。将其转化为
N-苄氧羰基-2,2-二
氟-
1-乙烯基
乙胺 (5),然后进行氧化,最后对胺进行脱保护,就得到了
3,3-二氟丙氨酸。