Reactions of α-imino ketones derived from arylglyoxals with (trifluoromethyl)trimethylsilane; a new route to β-amino-α-trifluoromethyl alcohols
作者:Grzegorz Mloston、Emilia Obijalska、Agnieszka Tafelska-Kaczmarek、Marek Zaidlewicz
DOI:10.1016/j.jfluchem.2010.07.012
日期:2010.12
The reactions of α-imino ketones, derived from arylglyoxals, with (trifluoromethyl)trimethylsilane (CF3SiMe3) in DME solution, in the presence of catalytic amount of CsF, at room temperature, yield O-silylated β-imino alcohols in the chemoselective manner. Subsequent reduction of these products with NaBH4 in ethanolic solution leads to the corresponding β-(N-alkyl)amino-α-trifluoromethyl alcohols in
在室温下,在催化量的CsF存在下,芳基乙二醛衍生的α-亚氨基酮与(三氟甲基)三甲基硅烷(CF 3 SiMe 3)在DME溶液中反应,生成O-甲硅烷基化的β-亚氨基醇。化学选择性方式。随后在乙醇溶液中用NaBH 4还原这些产物可得到相应的β-(N-烷基)氨基-α-三氟甲基醇,收率良好至极佳。对映体纯的α-亚氨基酮(Ar = Ph或p -MeOC 6 H 4)的三氟甲基化,带有手性助剂,PhCH(Me)基团连接到氮原子上,产生非对映体产物的混合物,其比例为约3。3:2。