MgCl2-mediated nucleophilic addition/deacetylation sequence in the presence of a base in an alcoholic solvent. Salient merits of this chemistry include step-economy, ease of work-up, mild conditions, broad substrate scope, functional group tolerance and scalability. The high efficiency and practicability enabled rapid access to diverse precursors of malonamides for use in pharmaceuticals.
Organocatalytic Aza-Michael/Mannich Cascade Reaction: Synthesis of Enantioenriched 3,3′-Spirooxindole γ-Lactams
作者:Xiao-Tong Li、Heng-Zhi Tian、Xing-Wen Sun
DOI:10.1021/acs.joc.2c00878
日期:2023.6.16
Highly enantioselective synthesis of 3,3′-spirooxindole γ-lactams with three contiguous stereocenters (two quaternary) was achieved. The aza-Michael/Mannich cascade reaction of α-imine-β-oxobutanamides and methyleneindolinones catalyzed by a bifunctional diaminocyclohexane-derived thiourea catalyst gave the desired products in moderate to good yields (up to 78%), moderate to good diastereoselectivities