Direct Acyl Substitution of Carboxylic Acids: A Chemoselective O- to N-Acyl Migration in the Traceless Staudinger Ligation
作者:Andrew D. Kosal、Erin E. Wilson、Brandon L. Ashfeld
DOI:10.1002/chem.201201773
日期:2012.11.5
chlorophosphite‐modified, Staudinger‐like acylation of azides involving a highly chemoselective, direct nucleophilic acyl substitution of carboxylicacids is described. The reaction provides the corresponding amides with analytical purity in 32–97 % yield after a simple aqueous workup without the need for a pre‐activation step. The use of chlorophosphites as dual carboxylic acid–azide activating agents
Efficient synthesis of carbon-11 labelled acylsulfonamides using [<sup>11</sup>C]CO carbonylation chemistry
作者:Berend van der Wildt、Bin Shen、Frederick T. Chin
DOI:10.1039/c8cc09661a
日期:——
Herein, a novel method for carbon-11 labeling of acyl sulfonamides by a one-step insertive [11C]CO carbonylative cross-coupling reaction between aryl halides and sulfonamides is presented. Various model compounds as well as drug molecules LY573636 (tasisulam) and ABT-199 were obtained in excellent yields. This method provides a valuable and widely applicable contribution to the continuously expanding
Sequential <i>ortho</i>-/<i>meta</i>-C–H functionalizations of <i>N</i>-tosyl-benzamides for the synthesis of polyfunctionalized arenes
作者:Martin Vuagnat、Philippe Jubault、Tatiana Besset
DOI:10.1039/d3cc05919g
日期:——
A one-pot sequential process for the challenging ortho/meta C–H difunctionalizations of simple benzamide derivatives: a direct access to polyfunctionalized arenes.
Heteroannulation enabled by a bimetallic Rh(<scp>iii</scp>)/Ag(<scp>i</scp>) relay catalysis: application in the total synthesis of aristolactam BII
作者:Wei-Wei Ji、E. Lin、Qingjiang Li、Honggen Wang
DOI:10.1039/c7cc02105d
日期:——
redox-neutral bimetallic Rh(III)/Ag(I) relay catalysis allowed the efficient construction of 3-alkylidene isoindolinones and 3-alkylidene isobenzofuranones. The Rh(III) catalyst was responsible for the C–H monofluoroalkenylation reaction, whereas the Ag(I) salt was an activator for the follow-up cyclization. The methodology developed was applied as a key step in the rapid totalsynthesis of the natural product
Electrochemical Migratory Cyclization of
<i>N</i>
‐Acylsulfonamides
作者:Zhaojiang Shi、Yuanyuan Li、Nan Li、Wei‐Zhen Wang、Hao‐Kuan Lu、Hong Yan、Yaofeng Yuan、Jun Zhu、Ke‐Yin Ye
DOI:10.1002/anie.202206058
日期:2022.7.25
Electrochemicalmigratorycyclization of N-acylsulfonamides has been developed for the facile preparation of a diverse array of biologically interesting yet synthetically challenging benzoxathiazine dioxides.