Trienediolates of hexadienoic acids in synthesis. Addition to unsaturated ketones. A convergent approach to the synthesis of retinoic acids
作者:Maria J. Aurell、Luisa Ceita、Ramon Mestres、Margarita Parra、Amparo Tortajada
DOI:10.1016/0040-4020(95)00114-n
日期:1995.3
The regioselectivity of the addition of the lithium trienediolates generated from hexa-2,4dienoic acids 1 and 2 or the dihydropyran-2ones 4 and 5 to unsaturated ketones 6 is studied. Equilibration conditions favour reaction of the trienediolates through their ω carbon, and the ketones according to 1,2- and 1,4-additions. β-Ionone 6a and the aryl-butenone 6b lead to the 1,2-ω-adducts 8, which undergo
研究了由六-2,4-二烯酸1和2或二氢吡喃-2酮4和5生成的三烯二醇锂加成到不饱和酮6上的区域选择性。平衡条件有利于三烯二醇化物通过它们的ω碳与酮根据1,2-和1,4-加成的反应进行反应。β-紫罗兰酮6a和芳基丁烯酮6b导致1,2-ω-加合物8,其经历容易的酸催化的脱水成视黄酸11。与不饱和酮6b或与芳基酮21反应时,三甲基二氢吡喃-2one S会导致γ-加合物,该加合物是由链状甲基取代基的去质子化以及1,4-ω-加合物形成的。