Synthesis and Pesticidal Properties of Thio and Seleno Analogs of Some Common Urea Herbicides
作者:Jerzy Zakrzewski、Maria Krawczyk
DOI:10.1080/10426500802391692
日期:2009.7.13
Thio and seleno analogs of fenuron, isoproturon, chlorotoluron, metoxuron, monuron, and diuron were synthesized from the corresponding aryl amines. Their reaction with thiophosgene leads to isothiocyanates. Aryl amines were also converted (via isocyanides) to isoselenocyanates. The reaction of both isothio- and isoselenocyanates with dimethylamine affords the corresponding thio and seleno analogs of
An environmentally benign, simple and highly efficient protocol for the synthesis of S-arylisothiourea derivatives has been achieved in good to excellent yields by reacting a series of aryliodides with arylthioureas, using inexpensive CuSO4·5H2O as catalyst in water without PTC (phase transfer catalyst). The protocol features easy performance, good to excellent yields, good tolerance towards a variety
A convenient and efficient protocol has been developed for the preparation of aryl-isothioureas based on the Chan-Lam C-S couplingreaction. The desired aryl-isothioureas were synthesized in good yields (up to 95%) in the presence of Cu(OAc)(2)H2O as catalyst and bipyridine as ligand. A variety of functional groups on the aryl-thiourea and arylboronic acid reagents are tolerated. The method features
Insertion of Arynes into Thioureas: A New Amidine Synthesis
作者:Kallolmay Biswas、Michael F. Greaney
DOI:10.1021/ol202049v
日期:2011.9.16
thioureas via a formal π-insertion into the C═S bond. The reaction contrasts with that of ureas, which proceeds via benzyne σ-insertion into the C–N bond, and represents a new, operationally simple route to functionalized amidines.
Copper-Catalyzed and Air-Mediated Mild Cross-Dehydrogenative Coupling of Aryl Thioureas and Dialkyl<i>H</i>-Phosphonates: The Synthesis of Thiophosphonates
A copper-catalyzed and air-mediated mild cross-dehydrogenative coupling of arylthioureas and dialkyl H-phosphonates to produce thiophosphonates has been reported. Without addition of base or acid, air as an oxidant, the phosphorylation occurred smoothly to give the target products in moderate to excellent yields at room temperature. The protocol allows the direct formation of a sulfur–phosphorus bond