Squaric acid catalyzedthree-component Mannich reaction of aromatic aldehydes, aromatic amines and cyclic ketones in water and solvent-free conditions at room temperature. This protocol has several advantages such as good yields, mild conditions, novel organocatalyst, and good anti selectivities.Graphical AbstractSquaric acid catalyzedthree-component Mannich reaction of aromatic aldehydes, aromatic
Antiselective Three-Component Mannich Reactions in Thiopyran-4-one System
作者:M. Saeed Abaee、Mohammad M. Mojtahedi、Ali Akbari、Ehsan Mehraki、A. Wahid Mesbah、Klaus Harms
DOI:10.1002/jhet.976
日期:2012.11
The one‐pot, three‐component Mannichreactions of thiopyran‐4‐one 1 with different aromatic aldehydes and aniline derivatives in the presence of catalytic quantities of ZrOCl2.8H2O (15 mol %) led to rapid and high yield formation of various 3‐methylamino substituted derivatives of 1 at room temperature. Spectroscopic and X‐ray analyses of the products suggested the formation of the anti stereoisomers