Selective, one-pot synthesis of 2,3,6-trisubstituted pyridine and 2-cyclohexen-1-one derivatives from bicyclic ketals
作者:Jong-Gab Jun、Tae Hee Ha
DOI:10.1002/jhet.5570340151
日期:1997.1
Boron difluoromethanesulfonate, prepared from 5 equivalents of trimethylsilyl methanesulfonate and 1 equivalent of boron trifluoride etherate, has proved to be an active Lewis acid catalyst for the one-pot transformation reaction of bicyclic ketals in the 6,8-dioxabicyclo[3.2.1]octane series to 2,3,6-trisubstituted pyridine or 2-cyclohexen-1-one selectively, depending on conditions. A 1,5-diketone
由5当量的甲磺酸三甲基甲硅烷基酯和1当量的三氟化硼乙醚组成的二氟甲磺酸硼已被证明是在6,8-二氧杂双环[3.2.1]辛烷中一锅转化双环缩酮的有效路易斯酸催化剂。取决于条件,选择性地将其串联成2,3,6-三取代的吡啶或2-环己烯-1-酮。1,5-二酮是两种产物的反应中间体。通过使用腈作为溶剂或试剂选择性地形成吡啶,但是在二氯甲烷中代替腈制备了环己烯酮。