Dearomatization‐Rearomatization Strategy for
<i>ortho</i>
‐Selective Alkylation of Phenols with Primary Alcohols
作者:Jianjin Yu、Chao‐Jun Li、Huiying Zeng
DOI:10.1002/anie.202010845
日期:2021.2.19
the synthesis of site‐specificallysubstituted phenols is challenging, and thus the development of new methods for this purpose would be highly desirable. Reported here is a protocol for palladium‐catalyzed ortho‐selective alkylation reactions of phenols with primary alcohols by a dearomatization‐rearomatization strategy, with water as the sole by‐product. Various substituted phenols and primary alcohols
Catalytic cyclization of cis-1-ethynyl-2-vinyloxiranes was implemented with TpRuPPh3(CH3CN)2PF6 catalyst (10 mol%), to give 2,6-disubstituted phenols in reasonable yields. Under similar conditions, 1,1,2,2-tetrasubstituted oxirane gave the 2,3,6-trisubstituted phenol with skeleton reorganization. On the basis of 2H- and 13C-labeling results, we propose that the reaction mechanism involves electrocyclization of ruthenium-vinylidene intermediate with cleavage of the carbon-oxygen bond of the epoxide.
Palladium-catalyzed aerobic synthesis of <i>ortho</i>-substituted phenols from cyclohexanones and primary alcohols
作者:Huiying Zeng、Jianjin Yu、Chao-Jun Li
DOI:10.1039/c9cc09347h
日期:——
precursors of chemical products, synthesis of site-specific substituted phenols is highly desirable and a significant challenge. An aerobic palladium-catalyzed site-specific synthesis of ortho-substituted phenols from cyclohexanones and primary alcohols via an oxidation/aldol/dehydration/aromatization process has been developed. Various substituted cyclohexanones and primary alcohols are successfully transformed