A new regioselective synthesis of 2,3,4,5-tetrahydro-6<i>H</i>-oxepino[3,2-<i>c</i>]pyran-6-ones, and [1]benzopyran-6-ones
作者:Pierfrancesco Bravo、Massimo Frigerio、Calimero Ticozzi
DOI:10.1002/jhet.5570250252
日期:1988.3
intramolecular dehydration, involving the primary alcohols obtained and the enolic oxygen of the rings, promoted by Amberlyst 15 in boiling toluene, the new heterocycles 2,3,4,5-tetrahydro-6H-oxepino[3,2-c]pyran-6-one (3) and [1]benzopyran-6-ones ba,c were obtained in fair yields.
通过4-羟基-2-吡喃酮和4-羟基香豆素的一些烯烃衍生物的抗马尔科夫尼科水合,然后进行区域选择性分子内脱水,其中涉及得到的伯醇和由Amberlyst促进的环的烯醇氧15在沸腾的甲苯中,新的杂环2,3,4,5-四氢-6- ħ恶庚因并[3,2- c ^ ]吡喃-6-酮(3)和苯并吡喃-6-酮[1] BA,C获得以合理的收益率。