PIDA-Promoted/HFIP-Controlled Dearomative Spirocyclization of Phenolic Ketones via a Spirocyclohexadienone-Oxocarbenium Cation Species
作者:Shiyong Peng、Jieyin He、Liangliang Yang、Hong Zhang、Hongguang Li、Ming Lang、Chao Chen、Jian Wang
DOI:10.1021/acs.joc.2c00482
日期:2022.5.6
conditions. Control experiments unravel that the reaction proceeds through a spirocyclohexadienone-oxocarbenium cation species. In addition, an in situ-generated hypervalent iodine(III)-catalyzed version, as well as the late-stage transformation of products via conjugate additions, was also realized.
报道了苯碘(III)二乙酸盐促进/1,1,1,3,3,3-六氟异丙醇控制的酚酮脱芳环化,提供了两个结构有趣的支架文库,螺环己二烯酮缩酮及其乙酰氧基化对应物,中等至在温和的条件下获得优异的产量。对照实验揭示了反应通过螺环己二烯酮-氧代碳鎓阳离子物种进行。此外,还实现了原位生成的高价碘 (III) 催化形式,以及通过共轭添加实现产物的后期转化。