Novel “one-pot” preparation of tetrahydrobenzodipyran-4-ones. Application to the synthesis of precocene analogues with condensed dihydropyran rings
作者:F. Camps、O. Colomina、J. Coll、A. Messeguer
DOI:10.1016/0040-4020(82)85025-4
日期:1982.1
A novel one-pot preparation of tetrahydrobenzodipyran-4-ones 5 and 6 involving the sequential condensation of resorcinols 7 with 3,3-dimethylacrylic acid (8) and 1,3-methylbutane (10) in the presence of methansesulphonic acid (which acts as solvent and catalyst) and further conversion of tetrahydrobenzodipyran-4-ones to the corresponding dihydrobenzodipyrans 3 and 4, which are precocene analogues,
一种新颖的一锅法制备的四氢苯并二吡喃-4-酮5和6,涉及间苯二酚7与3,3-二甲基丙烯酸(8)和1,3-甲基丁烷(10)在甲基苯磺酸存在的情况下顺序缩合(其作用)描述了作为溶剂和催化剂的二氢苯并二吡喃-4-酮进一步转化为相应的二氢苯并二吡喃3和4,它们是前茂世类似物。