Promoting Effect of Crystal Water Leading to Catalyst-Free Synthesis of Heteroaryl Thioether from Heteroaryl Chloride, Sodium Thiosulfate Pentahydrate, and Alcohol
作者:Xiantao Ma、Jing Yu、Ran Yan、Mengli Yan、Qing Xu
DOI:10.1021/acs.joc.9b01670
日期:2019.9.6
can promote its multicomponent reaction with heteroaryl chlorides and alcohols, providing a facile, green, and specific synthesis of unsymmetrical heteroaryl thioethers via one-step formation of two C–S bonds under catalyst-, additive-, and solvent-free conditions. Mechanistic studies suggest that the crystal water in Na2S2O3·5H2O is crucial in generating the key thiol intermediates and byproduct NaHSO4
观察到五水硫代硫酸钠(Na 2 S 2 O 3 ·5H 2 O)中的结晶水可以促进其与杂芳基氯化物和醇类的多组分反应,从而一步一步提供了一种不对称的杂芳基硫醚的简便,绿色且特异的合成方法在无催化剂,无添加剂和无溶剂的条件下形成两个C–S键。机理研究表明,Na 2 S 2 O 3 ·5H 2 O中的结晶水对于生成关键的硫醇中间体和副产物NaHSO 4至关重要,后者可以催化醇被硫醇的脱水取代,从而制得硫醚。
Antitrichomonal activity of mesoionic thiazolo[3,2-a]pyridines
作者:Keith A. M. Walker、Eric B. Sjogren、Thomas R. Matthews
DOI:10.1021/jm00149a023
日期:1985.11
Screening of mesoioniccompounds as potential electron acceptors by analogy with metronidazole led to the finding of in vitro antitrichomonal activity for anhydro-2-phenyl-3-hydroxythiazolo [3,2-a]pyridinium hydroxide (1). In a series of analogues, potent in vitro activity was found to be associated with amino substitution; however, such activity was dependent on specific structural features and not
Versatile C(sp<sup>2</sup>)−C(sp<sup>3</sup>) Ligand Couplings of Sulfoxides for the Enantioselective Synthesis of Diarylalkanes
作者:William M. Dean、Mindaugas Šiaučiulis、Thomas E. Storr、William Lewis、Robert A. Stockman
DOI:10.1002/anie.201602264
日期:2016.8.16
The reaction of chiral (hetero)aryl benzyl sulfoxides with Grignard reagents affords enantiomerically pure diarylalkanes in up to 98 % yield and greater than 99.5 % enantiomeric excess. This ligand coupling reaction is tolerant to multiple substitution patterns and provides access to diverse areas of chemical space in three operationally simple steps from commercially available reagents. This strategy
alcohols, heteroaryl halides, and thiourea has been developed for direct and selective synthesis of heteroaryl thioethers. This method can be easily scaled up to the gram scale and extended to dialkyl thioethers, heteroaryl selenides, benzothiazoles, and some antimycobacterially‐active thioethers. Mechanisticstudies revealed that a by‐product‐promoted in situ C–O activation of alcohols to more reactive