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。
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.
antifungal drug discovery. In this report, the first-generation of small molecule SAP2 inhibitors was rationally designed and optimized using a structure-based approach. In particular, inhibitor 23h was highly potent and selective and showed good antifungal potency for the treatment of resistant Candidaalbicans infections.
Ytterbium(III) Triflate Catalyzed One-Pot Synthesis of 1,3-Thiazolidin-2-imines from Epichlorohydrin and Thioureas
作者:Weike Su、Chuangwei Liu、Weiguang Shan
DOI:10.1055/s-2008-1032100
日期:——
2-Arylimino-3-aryl-1,3-thiazolidines were successfully obtained from epichlorohydrin and thioureas in DMF catalyzed by Yb(OTf)3. Inversion of the configuration occurred at the chiral center of the epoxide.
Novel Synthesis of 2,4-Dihydro-5-amino[1,2,4]triazol-3-ones from 1,3-Disubstituted Thioureas
作者:Weike Su、Can Jin、Chuangwei Liu
DOI:10.1055/s-0028-1087563
日期:2009.3
A facile two-step synthesis of 2,4-dihydro-5-amino-[1,2,4]triazol-3-ones is described. Firstly, 1,3-disubstituted thioureas reacted with bis(trichloromethyl) carbonate (BTC) in the presence of a base such as NaHCO3 to form the intermediate 4-(arylimino)-1,3-thiazetidin-2-ones almost quantitatively. Then the intermediates were treated with hydrazine monohydrate to give 2,4-dihydro-5-amino[1,2,4]triazol-3-ones in high yields. In the case of highly sterically hindered thioureas, carbodiimides were unexpectedly obtained in high yields under the same conditions.