Highly Site-Selective Direct C–H Bond Functionalization of Phenols with α-Aryl-α-diazoacetates and Diazooxindoles via Gold Catalysis
摘要:
An unprecedented direct C H bond functionalization of unprotected phenols with alpha-aryl alpha-diazoacetates and diazooxindoles was developed. A tris(2,4-di-tert-butylphenyl) phosphite derived gold complex promoted the highly chemoselective and site-selective C H bond functionalization of phenols and N-acylanilines with gold-carbene generated from the decomposition of diazo compounds, furnishing the corresponding products in moderate to excellent yields at rt. The salient features of this reaction include readily available starting materials, unprecedented C H functionalization rather than X H insertion, good substrate scope, mild conditions, high efficiency, and ease in further transformation. To the best of our knowledge, this is the first example of C H functionalization of unprotected phenols with diazo compounds.
An iron-catalyzed arylation of α-aryl-α-diazoesters with electron-rich benzene rings was developed, which provides an efficient method for the preparation of 1,1-diarylacetates with high yields and excellent chemo- and regio-selectivities.
Rhodium Catalyzed Arylation of Diazo Compounds with Aryl Boronic Acids
作者:Jayanta Ghorai、Pazhamalai Anbarasan
DOI:10.1021/jo502922r
日期:2015.4.3
general and efficient synthesis of diarylacetate, a diarylmethine derivative, was accomplished through rhodium catalyzed directarylation of diazo compounds with arylboronic acids. The reaction tolerates various boronicacid derivatives and functional groups. Notably, chemoselective arylation of diazo compounds over other electrophiles were demonstrated. The efficacy of the developed methodology is shown
Rh(I)-Catalyzed Cross-Coupling of α-Diazoesters with Arylsiloxanes
作者:Ying Xia、Zhen Liu、Sheng Feng、Fei Ye、Yan Zhang、Jianbo Wang
DOI:10.1021/acs.orglett.5b00052
日期:2015.2.20
An Rh(I)-catalyzed cross-coupling of diazoesters with arylsiloxanes has been successfully achieved. This transformation is a new method for the construction of the C(sp(3))C(sp(2)) bond, thus providing an alternative synthesis of a-aryl esters. Rh(I)carbene migratory insertion has been proposed to be involved in this coupling reaction. The reaction represents the first example of utilizing arylsiloxane as the coupling partner in the carbene-involved cross-coupling reactions.