Direct Organocatalytic Asymmetric Heterodomino Reactions: The Knoevenagel/Diels−Alder/Epimerization Sequence for the Highly Diastereoselective Synthesis of Symmetrical and Nonsymmetrical Synthons of Benzoannelated Centropolyquinanes
作者:D. B. Ramachary、K. Anebouselvy、Naidu S. Chowdari、Carlos F. Barbas
DOI:10.1021/jo049581r
日期:2004.9.1
Aminoacids and amines have been used to catalyze three component hetero-domino Knoevenagel/Diels−Alder/epimerization reactions of readily available various precursor enones (1a−l), aldehydes (2a−p), and 1,3-indandione (3). The reaction provided excellent yields of highly substituted, symmetrical and nonsymmetrical spiro[cyclohexane-1,2‘-indan]-1‘,3‘,4-triones (5) in a highly diastereoselective fashion