AgN<sub>3</sub>-Catalyzed Hydroazidation of Terminal Alkynes and Mechanistic Studies
作者:Shanshan Cao、Qinghe Ji、Huaizhi Li、Maolin Pang、Haiyan Yuan、Jingping Zhang、Xihe Bi
DOI:10.1021/jacs.0c00836
日期:2020.4.15
hydroazidation of alkynes is the most straightforward way to access vinyl azides - versatile building blocks in organic synthesis. We previously realized such a fundamental reaction of terminalalkynes using Ag2CO3 as a catalyst. However, the high catalyst loading seriously limits its practicality, and moreover the exact reaction mechanism remains unclear. Here, on the basis of X-ray diffraction studies on the
Synthesis of β-Difluoroalkyl Azides via Elusive 1,2-Azide Migration
作者:Yongquan Ning、Paramasivam Sivaguru、Giuseppe Zanoni、Edward A. Anderson、Xihe Bi
DOI:10.1016/j.chempr.2019.12.004
日期:2020.2
development of azide migration reactions is a formidable challenge because of the potential competition of side processes driven by the release of molecular nitrogen. Here, we report a conceptually novel 1,2-azide migration in an unprecedented gem-difluorination of the readily available α-vinyl azides, a transformation that enables the synthesis of a range of novel β-difluorinated alkyl azides. The practicality
Abstract Tf2NH-catalyzed tandem 1,6-conjugate addition/Schmidt type rearrangement using vinyl azides and p-quinone methides to access a variety of β-bis-arylated amides is reported. The method is quick, efficient, mild, and high yielding with broad substrate scope. Tf2NH-catalyzed tandem 1,6-conjugate addition/Schmidt type rearrangement using vinyl azides and p-quinone methides to access a variety
Silver‐Catalyzed Oxyphosphorylation of Unactivated Alkynes
作者:Binbin Liu、Qingmin Song、Zhaohong Liu、Zikun Wang
DOI:10.1002/adsc.202100226
日期:2021.7
Here, we describe an application of hydroazidation in the instant activation of alkynes for achieving the oxyphosphorylation of unactivated alkynes with diarylphosphinoyl radicals under mild reaction conditions. This reaction provides a method for accessing β-ketophosphine oxides and phosphorus-containing pyrroles.