Variously N,N-disubstituted chiral dibromofluoromethylphosphonamides 3 were easily prepared and used for the asymmetric electrosynthesis, in the presence of tert-butyl acrylate, of α-fluorinated cyclopropylphosphonamides 7. The diastereoisomeric excesses are moderate (up to 40%). Moreover, the identification of the trans and cis stereoisomers has been deduced from analysis of 2D 1Hâ19F HOESY spectra.
在
丙烯酸叔丁酯存在下,轻松制备了各种 N,N-二取代手性二
溴氟甲基膦酰胺 3,并将其用于δ-
氟化
环丙基膦酰胺 7 的不对称电合成。非对映异构体的过量程度适中(高达 40%)。此外,还通过分析二维 1Hâ19F HOESY 光谱推断出了反式和顺式立体异构体。