Efficient synthesis of tetrahydroquinolinones by acetic acid-mediated formal [3+3] cycloaddition
摘要:
A simple and efficient method to synthesize a variety of tetrahydroquinolinones was successfully achieved by reacting various beta-enaminones with several alpha,beta-unsaturated aldehydes. This strategy can be viewed as a Bronsted acid-mediated formal [3+3] cycloaddition.
Brønstedacidscatalyze the addition of enolizable β-diketones, β-ketoesters, and vinylogous amides to α,β-unsaturated aldehydes to lead to substituted chromenones, pyranones, and tetrahydroquinolinones in good yields under mild reaction conditions via a formal [3 + 3] cycloaddition.