Photoredox Catalytic Phosphite‐Mediated Deoxygenation of α‐Diketones Enables Wolff Rearrangement and Staudinger Synthesis of β‐Lactams
作者:Hui Yang、Haijun Li、Guo Wei、Zhiyong Jiang
DOI:10.1002/anie.202107080
日期:2021.9
activation of C=O bonds by exploiting the photoredox chemistry of 1,3,2-dioxaphospholes, readily accessible fromα-diketones and trialkyl phosphites, is reported. This mild and environmentally friendly strategy provides an unprecedented and efficient access to the Wolff rearrangement reaction which traditionally entails α-diazoketones as precursors. The resulting ketenes could be precisely trapped by
A simple protocol for the synthesis of α-diarylacetic esters from benzoins is described. In situ generated acetal assists rapid 1,2-arylmigration in a stereospecific manner, paving the way to make enantioenriched α-diarylacetic esters from easily accessible enantiopure benzoins.
The investigation of the mechanism of oxidative-cleavage reaction of azibenzil in alcohol to give benzoates revealed the role of oxygen (either 102 or 302) in the photolysis of α-diazoketone.
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.