Hypervalent Iodine(III)-Mediated Regioselective N-Acylation of 1,3-Disubstituted Thioureas
摘要:
Reaction of asymmetrical 1,3-disubstituted thioureas with diacetoxyiodobenzene (DIB) produces regioselectively N-acetylurea in shorter time. Regioselectivity is dependent on the pK(a)'s of the amine attached to the thiourea moiety with acylation taking place toward the an-tine having a lower pK(a). This is the first example of DIB being employed as an N-acetylating agent. A mechanism for this novel transformation is also proposed. Mild reaction conditions, shorter reaction times, high efficiencies, environmentally benign methods, and facile isolation of the desired product make the present methodology a most suitable alternative.
N-acetylureas were synthesised regioselectivelyfrom 1,3-disubstituted selenoureas and zinc acetate. Regioselectivity was dependent on the pKa of the amine attached to the selenourea and occurred towards the amine with the lower pKa. The approach provided a simple, mild and efficient way to construct various N-acetylureas regioselectively in moderate to good yields (53–88%). A plausible mechanism was
Regioselective Acetylate of 1,3-Disubstituted Selenoureas Promoted by Recyclable Ion-Supported Hypervalent Iodine(III) Reagent
作者:Yuanyuan Xie、Haixuan Pan
DOI:10.1080/10426507.2013.797418
日期:2014.1
environmentally friendly reaction of 1,3-disubstituted selenoureas with a recyclable ion-supported hypervalent iodine(III) reagent produces regioselectively N-acetylureas. This is the first example of ion-supported hypervalent iodine reagent [dibmim]+[BF4]−being employed as an N-acetylating agent. Supplemental materials are available for this article. Go to the publisher's online edition of Phosphorus, Sulfur, and
An effective method was explored for the one-potsynthesis of N-acylated urea derivatives by the reaction of substituted isothiocyanatobenzenes, primary amines and PIDA (phenyliodine (III) diacetate) in one-pot manner. Mild reaction conditions, short reaction time, high efficiency and readily accessible materials are the features of this method, making suitable and alternative for the preparation of
Oxidative desulfurization of disubstituted thioureas using Pb(II) salts and investigation of p<i>K</i><sub>a</sub>-dependent regioselective N-acylation
作者:Harisadhan Ghosh、Soumya Sarkar、Abdur Rezzak Ali、Bhisma K. Patel
DOI:10.1080/17415990903295686
日期:2010.2
A highly efficient method for the N-acylation of both symmetrical and unsymmetrical thioureas by the use of lead (II) salts and triethylamine has been achieved. The reaction gives regioselective N-acylated product for unsymmetrical thiourea. For unsymmetrical thiuourea, regioselective N-acylation takes place towards the amine having lower pKa. A linear correlation between the pKas of the amines and the regioselective N-acylation is found. Another attractive feature of this transformation is that lead sulfide, which is important to material science, is obtained as a side product (nanocubes of 20nm).