A revisit towards regioselective addition of in situ generated negative nucleophiles to allenic ketones in the presence of a base. A direct ring annulation towards the benzodioxin skeleton synthesis has been developed. In the process, the obtained E‐vinyl kenones were readily transformed into sulfones and 2,5‐disubstituted oxazole.
在存在碱的情况下,重新考虑向区域选择性地原位生成负亲核试剂至烯丙基酮。已开发出直接环环向苯并二恶英骨架合成的方法。在此过程中,获得的E-
乙烯基酮很容易转化为砜和2,5-二取代的
恶唑。