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。