Gold-Catalyzed Dearomative Spirocyclization of Aryl Alkynoate Esters
作者:Mark D. Aparece、Paul A. Vadola
DOI:10.1021/ol503022h
日期:2014.11.21
Aryl alkynoate esters undergo gold-catalyzedspirocyclization under mild conditions, affording spirolactones in high yields. This approach obviates the need for stoichiometric halogenating reagents typically employed for alkyne activation in related transformations. Water was found to play a critical role in governing the product selectivity. Anhydrous conditions lead selectively to coumarin products
PIFA-Mediated Dearomatizative Spirocyclization of Phenolic Biarylic Ketones via Oxidation and C–C Bond Cleavage
作者:Gui-Hua Zhao、Bi-Qing Li、Shuang-Shuang Wang、Man Liu、Yuan Chen、Bin Wang
DOI:10.1021/acs.joc.0c00971
日期:2020.7.17
The dearomatizing spirocyclization of phenolic biarylic ketones using PhI(OCOCF3)2 as oxidant is presented. The reaction affords various cyclohexadienones through C–Cbondcleavage under mild conditions. Mechanistic investigations reveal that an exocyclic enol ether acts as the key intermediate in the transformation.