An efficient [3+2] cycloaddition of nitrones and carbodiimides has been developed. This 1,3-dipolar cycloaddition features high regioselectivity, mild and metal-free conditions, excellent functional group compatibility, and a broad substrate scope. The X-ray structures of two regio-isomers confirmed the regioselectivity of this transformation.
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.
A greener synthetic protocol for the preparation of carbodiimide
作者:Abdur Rezzak Ali、Harisadhan Ghosh、Bhisma K. Patel
DOI:10.1016/j.tetlet.2009.12.017
日期:2010.2
A new and facile preparation of symmetrical and unsymmetrical 1,3-diaryl and aryl-alkyl carbodiimides via a dehydrosulfurisation of their corresponding thioureas is described. Herein, the classical method of oxidative desulfurisation of thiourea to carbodiimide involving toxic heavy metal oxides (HgO) has been replaced with an easily available, cost-effective and environmentally benign reagent, iodine. Simple reaction conditions, easy purification of the products and high yields are important attributes of the present methodology and perhaps the best alternative from a green chemistry perspective. The only limitation to this method however, is in the preparation of 1,3-dialkyl Substituted carbodiimide. (C) 2009 Elsevier Ltd. All rights reserved.
KATRITZKY A. R.; NIE PAI-LIN; DONDONI A.; TASSI D., J. CHEM. SOC. PERKIN TRANS., 1979, PART 1, NO 8, 1961-1963
作者:KATRITZKY A. R.、 NIE PAI-LIN、 DONDONI A.、 TASSI D.
DOI:——
日期:——
KATRITZKY A. R.; NIE P.-L.; DONDONI A.; TASSI D., SYNTH. COMMUN., 1977, 7, NO 6, 387-392
作者:KATRITZKY A. R.、 NIE P.-L.、 DONDONI A.、 TASSI D.