Various N-aryl-N'-phenylthioureas, N, N'-diarylthioureas and N-(1, 2, 4-triazol-3-yl)-N'-arylthioureas were prepared and examined for uncoupling activities. The results indicate that substitution at the 4-position of the phenyl groups of diaryl thioureas is very important for uncoupling activities. Diphenyl thioureas substituted with two or more halogen atoms exhibited strong activities. The highest activity was exhibited by a compound containing nitro groups on both phenyl groups. These results indicate that the hydrophobicity and acidic nature of the compound are of primary importance for uncoupling activities. A remarkable decrease in activity was observed with the thioureas which were substituted with pyridine and 1, 2, 4-triazole rings. The reaction of phenyl isothiocyanate with 3-amino-1, 2, 4-triazole was also studied.
ABATRACT A direct approach to N,N′-disubstituted urea/thiourea from the self-condensation reactions of isothiocyanates in water has been developed. This access tolerated a wide range of functional groups on the aromatic ring, providing a practical and environment-friendly process to N,N′-disubstituted urea/thiourea in moderate to excellent yields from safe and easily available starting materials. A
ABATRACT 已经开发了一种从异硫氰酸酯在水中的自缩合反应直接得到N , N '-二取代脲/硫脲的方法。这种访问容忍了芳环上的多种官能团,为N , N '-二取代脲/硫脲提供了一种实用且环境友好的工艺,从安全且易于获得的起始材料以中等至优异的产率。还提出了尿素脱硫自缩合反应的合理机理,并借助中间体研究的 ESI 质谱分析证明了二叔丁基过氧化物 (DTBP) 和铜催化剂在本策略中的作用。
An Environmentally Benign Method for the Synthesis of Symmetrical<i>N, N</i>′-Disubstituted Thioureas in a Water Medium
An environmentally benign method for the synthesis of symmetrical N, N′-disubstitutedthioureas in a water medium using poly(ethylene glycol)-400 (PEG-400) as a catalyst and a microwave as a heating source is described. Diaryl- and dialkyl-thioureas efficiently are synthesized by the reactions of thiourea with a variety of amines. This protocol has advantages of (a) no use of hazardous reagents and
A simple and straightforward synthesis of phenyl isothiocyanates, symmetrical and unsymmetrical thioureas under ball milling
作者:Ze Zhang、Hao-Hao Wu、Ya-Jun Tan
DOI:10.1039/c3ra43252a
日期:——
anilines were efficiently transformed into isothiocyanates (in presence of 5.0 equiv. CS2) or symmetricalthioureas (in presence of 1.0 equiv. CS2), without using any other harsh or toxic decomposition reagent. Some in situ generated isothiocyanates can directly “click” with other amines to afford unsymmetricalthioureas.
FACILE CONVERSION OF 1,3-DISUBSTITUTED THIOUREAS TO THE CORRESPONDING UREAS BY SUPEROXIDE RADICAL ANION (O<sub>2</sub><sup>·−</sup>) IN DIMETHYL SULFOXIDE
作者:Yong Hae Kim、Gyu Hwan Yon、Hyung Jin Kim
DOI:10.1246/cl.1984.309
日期:1984.3.5
Treatment of 1,3-disubstituted thioureas with superoxide radical anion (O2·−) at 20 °C in dimethyl sulfoxide resulted in the formation of 1,3-disubstituted ureas in excellent yields. The desulfurization appears to proceed by the formation of peroxy-sulfur intermediates such as peroxy-sulfenate, -sulfinate and/or -sulfonate.
在 20 °C 的二甲基亚砜中用超氧自由基阴离子 (O2·-) 处理 1,3-二取代硫脲导致以极好的产率形成 1,3-二取代脲。脱硫似乎是通过形成过氧-硫中间体如过氧-亚磺酸盐、-亚磺酸盐和/或-磺酸盐进行的。