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Metal-free Brønsted acid catalyzed formal [3 + 3] annulation. straightforward synthesis of dihydro-2H-chromenones, pyranones, and tetrahydroquinolinones. 2009
Julie Moreau, and
Claudie Hubert, and
Jessika Batany, and
Loic Toupet, and
Thierry Roisnel, and
Jean-Pierre Hurvois, and
Jean-Luc Renaud
Sciences Chimiques de Rennes, Catalyse et Organométalliques, UMR 6226, CNRS-Université de Rennes 1, Campus de Beaulieu-35042 Rennes Cedex, France.
Brønsted acids catalyze the addition of enolizable beta-diketones, beta-ketoesters, and vinylogous amides to alpha,beta-unsaturated aldehydes to lead to substituted chromenones, pyranones, and tetrahydroquinolinones in good yields under mild reaction conditions via a formal [3 + 3] cycloaddition.
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