Expedient Synthesis of α-(2-Azaheteroaryl) Acetates via the Addition of Silyl Ketene Acetals to Azine-<i>N</i>-oxides
作者:Allyn T. Londregan、Kristen Burford、Edward L. Conn、Kevin D. Hesp
DOI:10.1021/ol501359r
日期:2014.6.20
A new and expedient synthesis of α-(2-azaheteroaryl) acetates is presented. The reaction proceeds rapidly under mild conditions via the addition of silyl ketene acetals to azine-N-oxides in the presence of the phosphonium salt PyBroP. This procedure affords diverse α-(2-azaheteroaryl) acetates which are highly desirable components/building blocks in molecules of pharmaceutical interest but are traditionally
electrochemical N-ortho-selective difluoromethylation method of various quinoline and isoquinoline N-oxides has been developed. In this method, sodium difluoromethanesulfinate (HCF2SO2Na) was used as the source of the difluoromethyl moiety, and various N-ortho-selective difluoromethylation quinoline and isoquinoline N-oxides were obtained in good to excellent yields under a constant current. In addition, the reaction
开发了一种高效、绿色的电化学N-邻位选择性二氟甲基化各种喹啉和异喹啉N-氧化物的方法。在该方法中,以二氟甲基亚磺酸钠(HCF 2 SO 2 Na)为二氟甲基部分的来源,在恒定电流下以良好至优异的收率获得了各种N-邻位选择性二氟甲基化喹啉和异喹啉N-氧化物。此外,该反应易于放大并保持良好的收率。初步机理研究表明,该反应经历了自由基加成和氢消除途径。
Preparation of Azinones from (Cyclopropylmethoxy)azine Ethers
作者:Allyn T. Londregan、John M. Curto、Emma Hastry、Colin R. Rose、Simon Berritt
DOI:10.1021/acs.joc.3c00145
日期:2023.5.5
A general and convenient procedure for the synthesis of azinones is presented. Cyclopropylmethanol is readily introduced onto various azines where it functions as both a protecting group and surrogate for hydroxyl. After acidic deprotection, under mild reaction conditions, the corresponding azinones are formed and isolated in excellent yields. >20 examples are included along with a discussion of reaction