Synthesis of β-amino-α,α-difluoroketones by reactions of 1,1-difluorovinyl methyl ethers with N-acyliminium intermediates
作者:Yoshitoshi Kodama、Masato Okumura、Noriko Yanabu、Takeo Taguchi
DOI:10.1016/0040-4039(95)02348-8
日期:1996.2
An efficient preparation of β-amino-α,α-difluoroketones 4 was developed. Reactions of 1,1-difluorovinyl methyl ethers 1 with N-acyliminium intermediates, generated by treating biscarbamates 2 with trifluoromethanesulfonic anhydride (Tf2O) in the presence of molecular sieves 4A (MS 4A), provided 4 in good yields.
开发了β-氨基-α,α-二氟酮4的有效制备方法。在分子筛4A(MS 4A)存在下,通过用三氟甲磺酸酐(Tf 2 O)处理双氨基甲酸酯2生成的1,1-二氟乙烯基甲基醚1与N-酰基亚胺中间体的反应提供了高收率的4。