trisubstituted thioureas of arylamines is presented, for the first time, using in situ generated dithiocarbamates of secondary amines. This strategy provides an excellent opportunity to access thioureas containing primary aryl amines. A non-isothiocyanate route to obtain thioureas is the advantage of this strategy, which may provide a useful route to synthesize a variety of biologically active derivatives of thioureas
Buu-Hoi et al., Bulletin de la Societe Chimique de France, 1956, p. 307,309
作者:Buu-Hoi et al.
DOI:——
日期:——
Tisler, Croatica Chemica Acta, 1957, vol. 29, p. 409
作者:Tisler
DOI:——
日期:——
A one-pot conversion of di-substituted thiourea to<i>O</i>-organyl arylthiocarbamate using FeCl<sub>3</sub>
作者:Santosh K. Sahoo、Supratim Chakraborty、Bhisma K. Patel
DOI:10.1080/17415993.2011.640328
日期:2012.4.1
Unsymmetrical thiourea, which on demand can generate isothiocyanate in the presence of FeCl3, can serve as a latent isothiocyanate functionality and circumvent the difficulties associated with the direct use of reactive isothiocyanate functionality. An unusual and unorthodox reactivity has been achieved during a one-pot reaction of an unsymmetrically di-substituted thiourea with an alcohol in the presence of FeCl3 leading to an expeditious synthesis of O-organyl arylthiocarbamates. In this reaction, a thiono-ester (C-O) bond is formed at the expense of a thioamidic (C-N) bond and works over a wide range of structurally diverse thioureas and alcohols without affecting the other functional groups.[GRAPHICS].
Arylthioureas with bromine or its equivalents gives no ‘Hugerschoff’ reaction product
作者:Ramesh Yella、Siva Murru、Abdur Rezzak Ali、Bhisma K. Patel
DOI:10.1039/c003892j
日期:——
The in situ generated arylâalkyl unsymmetrical thiourea obtained by the reaction of an aryl isothiocyanate with an aliphatic secondary amine on treatment with bromine or its equivalent gave exclusively a product having a thioamido guanidino moiety and not the expected Hugerschoff product 2-aminobenzothiazole. A plausible reaction mechanism has been proposed for this unprecedented transformation and the scope has been extended to various substrates.