An Efficient Direct Asymmetric Synthesis of 3-Substituted Phthalides
作者:Xin-Fang Duan、Zhan-Bin Zhang、Yong-Qin Lu
DOI:10.1055/s-0030-1260222
日期:2011.11
A facile, two-step, asymmetric synthesis of 3-substituted phthalides has been developed. The enantiopure amide, obtained through coupling of 2-iodobenzoic acid with (S)-1-(pyrrolidin-2-ylmethyl)-1H-imidazole, was magnesiated using isopropylmagnesium chloride. Corresponding reactions with a range of aldehydes were carried out in situ by either direct addition or transmetallation using zinc(II) chloride