Synthesis of Thiocarbamates from Thiols and Isocyanates Under Catalyst- and Solvent-Free Conditions
作者:Barahman Movassagh、Mohammad Soleiman-Beigi
DOI:10.1007/s00706-007-0762-7
日期:2008.2
A simple and efficient procedure was developed for the synthesis of S -alkyl (aryl) thiocarbamates under solvent-free conditions without the use of a catalyst. The significant features of this protocol are (a) operational simplicity, (b) mild reaction conditions, (c) short reaction times, (d) solvent-free conditions, and (e) high product yields.
Nucleophilic Substitution Reactions of Aryl <i>N</i>-Phenyl Thiocarbamates with Benzylamines in Acetonitrile
作者:Hyuck Keun Oh、Jie Eun Park、Dae Dong Sung、Ikchoon Lee
DOI:10.1021/jo049845+
日期:2004.4.1
reactions of esters. This large rate increase and the similar change in the aminolysis rates that are reported to occur from aryl ethyl carbonate (EtOC(O)OC6H4Z; 2a) to aryl ethylthiocarbonate (EtOC(O)SC6H4Z; 2b) lead us to conclude that the aminolysis of 3b proceeds by a concerted mechanism in contrast to a stepwiseprocess for 3a. The negative ρXZ values (−0.63) and violation of the reactivity−selectivity
研究了芳基N-苯硫代氨基甲酸酯(PhNHC(O)SC 6 H 4 Z; 3b)与苄胺(XC 6 H 4 CH 2 NH 2)在乙腈中的氨解反应。速率比芳基N-苯基氨基甲酸酯(PhNHC(O)OC 6 H 4 Z; 3a)的相应反应快得多。速率从3a增加到3b大于在酯的逐步氨解反应中用噻吩氧化物取代苯酚离去基团所期望的值。据报道,从碳酸芳基乙酯(EtOC(O)OC 6 H 4 Z; 2a)到硫代碳酸芳基乙酯(EtOC(O)SC 6 H 4 Z; 2b)发生的速率大幅度提高,氨解率也发生了类似的变化。导致我们得出结论,与3a的逐步过程相反,3b的氨解是通过协同机制进行的。负ρ XZ值(-0.63)和违反反应性选择性原则(RSP)都支持所提出的机制。大β X所获得的值(1.3-1.5)被认为是表示在过渡状态,这是与比较大的动力学同位素效应是一致的(在很大程度上键制作ķ ħ / ķ d观察到> 1
Molecular iodine-mediated synthesis of thiocarbamates from thiols, isocyanides and water under metal-free conditions
作者:Wen-Hu Bao、Chao Wu、Jing-Ting Wang、Wen Xia、Ping Chen、Zilong Tang、Xinhua Xu、Wei-Min He
DOI:10.1039/c8ob01820k
日期:——
A metal-free and efficient molecular iodine-mediated protocol has been developed to prepare thiocarbamates from readily available thiols, isocyanides and water.
已开发出一种无金属、高效的分子碘介导的方法,可从易得的硫醇、异氰酸酯和水中制备硫代氨基甲酸酯。
A Novel One-Pot Solvent-Free, Triethylamine-Assisted, Selenium-Catalyzed Synthesis of Thiocarbamates from Nitroarenes, Carbon Monoxide, and Thiols
作者:Shiwei Lu、Xiaopeng Zhang
DOI:10.1055/s-2005-869839
日期:——
A novel one-pot solvent-free synthesis of a series of thiocarbamates is reported. Nitroarenes, carbon monoxide, and thiols are the starting materials, with cheap element selenium as catalyst; this method offers a simple access to thiocarbamates mostly in moderate to good yields. The selenium catalyst can be easily recovered and recycled.
A Selenium-Catalysed Synthesis of Thiocarbamates from Nitroarenes, Carbon Monoxide and Thiols under Mild Conditions
作者:Xiao-Peng Zhang、Shi-Wei Lu
DOI:10.3184/030823408x360346
日期:2008.10
An improved method for the selenium-catalysed synthesis of thiocarbamates under mild conditions has been developed. With acetone as solvent, the one-pot selenium-catalysed carbonylation of nitroarenes and thiols with carbon monoxide proceeds smoothly at atmosphericpressure and ambient temperature.