A new synthesis of α-oxoketene O,N-acetals has been developed from β-oxothioxo esters. Thus, the reaction of 2a-c with alkyl, allyl or cyclic primary amines in refluxing toluene and formic acid led to α-oxoketene O,N-acetals 3a-i in good yields.
An Efficient, One-Pot, Triton-B Catalyzed Synthesis of O-Alkyl-S-methyl Dithiocarbonates
作者:Devdutt Chaturvedi、Suprabhat Ray
DOI:10.1007/s00706-006-0514-0
日期:2006.9
A novel process for the one-stepconversion of a variety of primary and secondary alcohols into their O -alkyl- S -methyl dithiocarbonates using methyl iodide catalyzed by the Triton-B/CS2 system was developed. Thus, O -alkyl- S -methyl dithiocarbonates were obtained in very good to excellent yields. This protocol is mild and efficient compared to other methods.
Xanthates as Thiol Surrogates for Nucleophilic Substitution with Aryl Halides
作者:Anatolii I. Sokolov、Andrey A. Mikhaylov、Nadezhda S. Baleeva、Mikhail S. Baranov
DOI:10.1002/ejoc.202100647
日期:2021.8.13
We herein report an unprecedented xanthate-based protocol for the preparation of aryl-alkyl thioethers. Heating xanthates with aryl halides and namely cesium carbonate in methanol provides the target thioethers in generally good yields within short reaction times. This method allows one to avoid contact with odorous thiols and also to introduce substituents of which the corresponding thiols are virtually
Thioacylierung von Malonsäurederivaten mit Dithio- und Thionestern
作者:K. Hartke、L. Peshkar
DOI:10.1002/ardp.19683010810
日期:——
Malondinitril kondensieren mit Dithio‐ und Thionestern aliphatischer und aromatischer Carbonsäuren sowie mit Trithio‐ und Thionestern der Kohlensäure in Gegenwart von Alkalialkoholat zu den Alkalisalzen in 2‐Stellung substituierter 2‐Mercapto‐1‐cyan‐acrylnitrile 3, die durch Alkylierung entsprechend substituierte 2‐Alkylmercapto‐1‐cyan‐acryl‐nitrile 6 liefern. Die analoge Kondensation mit diversen Malonsäurederivaten
Process for the preparation of L-aspartic acid N-thiocarboxyanhydride
申请人:Pfizer Inc.
公开号:US04256897A1
公开(公告)日:1981-03-17
An improved process for the preparation of L-aspartic acid N-thiocarboxyanhydride by the reaction of a 0.75 to 1.25 molar solution of an N-alkoxy-thiocarbonyl L-aspartic acid in a lower alkyl acetate solvent with a phosphorous trihalide. The desired product is substantially insoluble in the lower alkyl acetate solvent and is recovered in pure form without further purification or separation steps.