2‐bis(di‐tert‐butylphosphinoxy)ethane (tBu2POCH2CH2OPtBu2) was synthesized. In the presence of this ligand, various N‐acyl enamides were obtained in good yields and chemoselectivity by Pd‐catalyzed carbonylation reaction of imines containing α‐H. Meanwhile, imines without α‐H could be transformed to N‐acyl imines, which form highly hindered amides by straightforward addition of Grignard reagents.
首次合成了二齿
次膦酸酯
配体1,2-双(二叔丁基次膦氧基)
乙烷(t Bu 2 POCH 2 CH 2 OP t Bu 2)。在存在这种
配体的情况下,通过Pd催化含α-H的
亚胺的羰基化反应,可以得到高收率和
化学选择性的各种N-酰基酰胺。同时,不含α-H的
亚胺可以转化为N-酰基
亚胺,通过直接添加格利雅试剂即可形成受阻酰胺。