Ni-Catalyzed Enantioselective <i>C</i>-Acylation of α-Substituted Lactams
作者:Masaki Hayashi、Shoshana Bachman、Satoshi Hashimoto、Chad C. Eichman、Brian M. Stoltz
DOI:10.1021/jacs.6b02120
日期:2016.7.27
α-quaternary-substituted lactams is reported. Ni-catalyzed three-component coupling of lactam enolates, benzonitriles, and aryl halides produces β-imino lactams that then afford β-keto lactams by acid hydrolysis. Use of a readily available Mandyphos-type ligand and addition of LiBr enable the construction of quaternary stereocenters on α-substituted lactams to form β-keto lactams in up to 94% ee.
GEM-DISUBSTITUTED PYRROLIDINES, PIPERAZINES, AND DIAZEPANES, AND COMPOSITIONS AND METHODS OF MAKING THE SAME
申请人:California Institute of Technology
公开号:US20200199114A1
公开(公告)日:2020-06-25
Described here are transition metal-catalyzed enantioselective arylation and vinylation reactions of α-substituted lactams, such as γ-lactams. The use of various electrophiles and ligands are described, and result in the construction of α-quaternary centers in good yields (up to 91% yield) and high enantioselectivities (up to 97% ee).
Reactions with 4-Hydroxy-2-methylbutananilides: Unexpected Formation of a Cyclopropanecarboxamide
作者:Maged K. G. Mekhael、Anthony Linden、Heinz Heimgartner
DOI:10.1002/hlca.201000370
日期:2011.1
1‐methylcyclopropanecarboxamide 10 in good yield. This base‐catalyzed cyclization offers a new approach to cyclopropanecarboxamides. Under similar conditions, the N‐monosubstituted 4‐hydroxy‐2‐methylbutanamide 2b gave the 3‐methylpyrrolidin‐2‐one 11. The structure of the cyclopropanecarboxamide 10 was established by X‐ray crystallography.
This disclosure provides methods for intermolecular enantioselective C-acylation of lactams with quaternary stereogenic centers by applying a chiral Ni catalyst. The methods comprise treating a lactam with a chiral Ni catalyst, an aryl nitrile, and an aryl halide.