Preparation of substituted 2-pyridones by thermal rearrangement of propargylic pseudoureas. Improvements in the 2-pyridone yields by variations of the pseudourea NR2 substituent
5‐(Cyano)dibenzothiophenium Triflate: A Sulfur‐Based Reagent for Electrophilic Cyanation and Cyanocyclizations
作者:Xiangdong Li、Christopher Golz、Manuel Alcarazo
DOI:10.1002/anie.201904557
日期:2019.7.8
and its reactivity as electrophilic cyanation reagent evaluated. The scalable preparation, easy handling and broad substrate scope of the electrophilic cyanation promoted by 9, which includes amines, thiols, silyl enol ethers, alkenes, electron rich (hetero)arenes and polyaromatic hydrocarbons, illustrate the synthetic potential of this reagent. Importantly, Lewis acid activation of the reagent is not
Palladium-Catalyzed Selective Synthesis of 2-Allyltetrazoles
作者:Shin Kamijo、Tienan Jin、Yoshinori Yamamoto
DOI:10.1021/jo026147l
日期:2002.10.1
The palladium-catalyzed three-component coupling (TCC) reaction of cyano compounds, allyl methyl carbonate, and trimethylsilylazide under a catalytic amount of Pd2(dba)3.CHCl3 (2.5 mol %) and tri(2-furyl)phosphine (10 mol %) gave various kinds of 2-allyltetrazoles in good to excellent yields. A pi-allylpalladium azide complex is proposed as a key intermediate in the TCC reaction.
One-electron photooxidation of carbazole in the presence of carbon tetrachloride. Part II. Carbon tetrachloride as a reaction medium. Use of ammonia after irradiation and during irradiation
作者:Bogumil Zelent、Gilles Durocher
DOI:10.1139/v82-353
日期:1982.10.1
In partI of this series of papers we proposed the mechanism of electron transfer as the primary photochemical reaction in the carbazole – carbon tetrachloride system along with a secondary photochemical reaction initiated by transformations of the radical cation of carbazole in the solvent cage resulting in intermediates:In this paper we discuss the influence of ammonia, used after and during irradiation