Enantioselective Organocatalytic Addition of Nitromethane to Trifluoromethyl Aryl Ketimines Promoted by Electron‐Rich Bifunctional Iminophosphoranes
作者:Milena Krstić、Maurizio Benaglia、Margherita Gazzotti、Eleonora Colombo、Miguel Sanz
DOI:10.1002/adsc.202201297
日期:——
organocatalysts featuring SPhos- or BIDIME phosphine units have been developed and successfully applied in the asymmetric addition of nitromethane to N-Boc-protected trifluoromethyl aryl ketimines. α-Trifluoromethyl β-nitroamines were obtained in 40–82% isolated yields and 80–95% enantioselectivities. A careful evaluation of the catalytic activity of BIMPs indicates that the catalysts derived from the combination
开发了具有 SPhos 或 BIDIME 膦单元的硫脲基亚氨基正膦 (BIMP) 有机催化剂,并成功应用于硝基甲烷与N的不对称加成反应-Boc 保护的三氟甲基芳基酮亚胺。α-三氟甲基 β-硝基胺的分离产率为 40-82%,对映选择性为 80-95%。对 BIMP 催化活性的仔细评估表明,通过手性 1,2-氨基醇衍生的硫脲-有机叠氮化物与富电子膦的施陶丁格反应得到的催化剂,促进了氟化酮亚胺上的氮杂-亨利反应最高的对映选择性,导致胺具有高达 95% ee 的四取代立体中心。反应也在克规模上进行,没有损失对映选择性。