A New Synthetic Protocol for the Preparation of Carbodiimides Using a Hypervalent Iodine(III) Reagent
作者:Yunyang Wei、Chenjie Zhu、Dan Xu
DOI:10.1055/s-0030-1258414
日期:2011.3
A new, simple, and efficient preparation of symmetrical and unsymmetrical carbodiimides from the corresponding thioureas via dehydrosulfurization using a hypervalent iodine(III) reagent is described. The oxidation afforded carbodiimides in excellent yields and high selectivity. A possible mechanism for the transformation is proposed. desulfurization - hypervalent iodine - oxidations - carbodiimides
An efficient and mild oxidative desulfurization procedure using o-iodoxybenzoic acid has been developed for the synthesis of carbodiimides starting from easily synthesizable 1,3-disubstituted thioureas.
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.
An efficient synthesis of imidodicarbonic diamides from 1,3-thiazetidin-2-ones with NH2OH·HCl via ring-opening reaction
作者:Wen-Yuan Tang、Jing-Jing Guo、Xing-Xing Gui、De-Man Han、Jian-Jun Li
DOI:10.1016/j.cclet.2014.10.015
日期:2015.1
Abstract A ring-opening process of 4-imino-1,3-thiazetidin-2-ones with NH2OH·HCl was described for the first time. Two different scaffolds of imidodicarbonic diamide were obtained selectively in good yields in the presence of organic base. The obtained imidodicarbonic diamides were demonstrated by X-ray diffraction analysis.
Powerful Approach to Heterocyclic Skeletal Diversity by Sequential Three-Component Reaction of Amines, Isothiocyanates, and 1,2-Diaza-1,3-dienes
作者:Orazio A. Attanasi、Silvia Bartoccini、Gianfranco Favi、Gianluca Giorgi、Francesca Romana Perrulli、Stefania Santeusanio
DOI:10.1021/jo2021949
日期:2012.1.20
By highly efficient, one-pot, three-componentreactions, combining one set of 1,2-diaza-1,3-dienes (DDs), primary amines, and isothiocyanates in a different sequential order of addition, heterocyclic skeletal diversity can be achieved. The key feature discriminating the different heterocyclic core formation is the availability of the N or S heteronucleophile to give the first Michael addition step