Clean and Economic Synthesis of Alkanesulfonyl Chlorides from S-Alkyl Isothiourea Salts via Bleach Oxidative Chlorosulfonation
作者:Jiaxi Xu、Zhanhui Yang、Bingnan Zhou
DOI:10.1055/s-0033-1338567
日期:——
Abstract A simple procedure for clean and economic synthesis of alkanesulfonyl chlorides via bleach-mediated oxidative chlorosulfonation of S-alkyl isothiourea salts is disclosed. This procedure is environment- and worker-friendly with the advantages of readily accessible materials and reagents, simple and safe operations, easy purification without chromatography, and affords high yields of up to 99%
Synthesis of Polysubstituted Pyrimidines from Ketene Dithioacetals Using KF/Al<sub>2</sub>O<sub>3</sub>Catalyst
作者:Shen-Yi Yu、Ya-Xian Cai
DOI:10.1081/scc-120026325
日期:2003.12
Abstract KF/Al2O3 was first used to catalyze the synthesis of 2-alkylthio-4- amino-5-cyano-6-methylthiopyrimidines 3a–f via the reaction of the ketenedithioacetals 1 (prepared from malononitrile) with isothiuronium salts 2a–f. Six pyrimidine compounds were prepared and all of their structures were confirmed by elemental analysis, 1H NMR, and IR. The reaction conditions (solvents, catalyst amounts
Nucleophilic Aromatic Substitution Reactions in Water Enabled by Micellar Catalysis
作者:Nicholas A. Isley、Roscoe T. H. Linstadt、Sean M. Kelly、Fabrice Gallou、Bruce H. Lipshutz
DOI:10.1021/acs.orglett.5b02240
日期:2015.10.2
DMSO, DMAc, and NMP in nucleophilic aromatic substitutionreactions (SNAr), a simple and environmentally friendly alternative is reported. Use of a “benign-by-design” nonionic surfactant, TPGS-750-M, in water enables nitrogen, oxygen, and sulfur nucleophiles to participate in SNAr reactions. Aromatic and heteroaromatic substrates readily participate in this micellar catalysis, which takes place at or
鉴于对偶极的巨大依赖性,非质子溶剂如DMF,DMSO,DMAC,和NMP中的亲核芳族取代反应(S Ñ报道的Ar),一个简单的和环境友好的替代品。在水中使用“良性设计”非离子表面活性剂TPGS-750-M可使氮,氧和硫亲核试剂参与S N Ar反应。芳族和杂芳族底物容易参与这种胶束催化,该胶束催化在环境温度或环境温度附近发生。
Synthesis of Sulfides by Reactions of 1,1-Dichloro-2-chloro-methylcyclopropane with S-Nucleophiles
作者:E. I. Mikhed’kina、P. V. Nedel’ko、V. V. Prezhdo
DOI:10.1007/s11178-005-0172-4
日期:2005.3
1,1-Dichloro-2-chloromethylcyclopropane reacts with thiolates to give 2,2-dichlorocyclopropylmethyl sulfides via replacement of the side-chain chlorine atom. The resulting sulfides are readily oxidized to the corresponding sulfones.
Abstract A variety of novel 2-alkylthiopyrimidines were synthesized through simple condensation of arylidenemalononitriles with different 2-alkylthiouronium halide derivatives catalyzed by anhydrous potassium carbonate (K2CO3). The reactions have been carried out under mild conditions in i-PrOH, and the products were obtained in moderate to good yields with a simple work-up method. Subsequently, some