KHMDS and KOtBu are well established as strong, hindered, non-nucleophilic Brønsted bases. However, in the present work these bases are applied as highly active Lewis base catalysts for the formal [2+2] cycloaddition of ketenes with aldehydes and imines.
K
HMDS 和 KOtBu 是公认的强效、受阻、非亲核布氏碱。然而,在本研究中,这些碱被用作高活性路易斯碱催化剂,用于烯酮与醛和
亚胺的正规 [2+2] 环加成反应。