Synthesis of fluorinated α-amino ketones part I: α-benzamidoalkyl mono- di- and trifluoromethyl ketones
作者:Michael Kolb、Jacqueline Barth、Bernhard Neises
DOI:10.1016/s0040-4039(00)84319-1
日期:1986.1
2-Phenyl-5(4H)-oxazolones, obtained from α-amino acids, are reacted with di- and trifluoro acetic anhydride by a modified Dakin-West procedure to yield in a one-pot reaction α-benzamidoalkyl-di- and trifluoromethyl ketones in good yields. The monofluoromethyl analogues were also prepared from α-amino acids, however the use of the highly toxic fluoroacetic anhydride was avoided. The key step is the
由
α-氨基酸制得的2-
苯基-5(4H)-
恶唑酮通过改良的Dakin-West方法与二
氟和
三氟乙酸酐反应,以一锅法反应生成α-
苯甲
酰胺基烷基二
氟和三
氟甲基酮收率高。单
氟甲基类似物也由
α-氨基酸制备,但是避免了使用剧毒的
氟乙酸酐。关键步骤是在相应的
溴甲基酮上进行卤素交换反应。