Metal-Free Brønsted Acid Catalyzed Formal [3 + 3] Annulation. Straightforward Synthesis of Dihydro-2<i>H</i>-Chromenones, Pyranones, and Tetrahydroquinolinones
作者:Julie Moreau、Claudie Hubert、Jessika Batany、Loic Toupet、Thierry Roisnel、Jean-Pierre Hurvois、Jean-Luc Renaud
DOI:10.1021/jo901238y
日期:2009.12.4
Brønsted acids catalyze 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.
布朗斯台德酸通过形式化的[3 + 3]在温和的反应条件下催化将可烯化的β-二酮,β-酮酸酯和乙烯基酰胺添加到α,β-不饱和醛中,从而以高收率生成取代的色农酮,吡喃酮和四氢喹啉酮。环加成。