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
and pharmaceutical compounds. A convenient and efficient copper-catalyzed S-arylation of arylthioureas usingdiaryliodoniumsalts is reported. The desired arylisothioureas were synthesized in good yields in the presence of CuCl as catalyst and K2CO3 as base, and a wide variety of functional groups on the arylthioureas and diaryliodoniumsalts were tolerated. The protocol affords an alternative synthesis
摘要 报道了使用二芳基碘鎓盐方便且有效的铜催化的芳基硫脲的S-芳基化。在作为催化剂的CuCl和作为碱的K 2 CO 3的存在下,以高收率合成了所需的芳基异硫脲,并且可以耐受芳基硫脲和二芳基碘鎓盐上的多种官能团。该协议提供了一些潜在有用的生物和药物化合物的替代合成方法。 报道了使用二芳基碘鎓盐方便且有效的铜催化的芳基硫脲的S-芳基化。在作为催化剂的CuCl和作为碱的K 2 CO 3的存在下,以高收率合成了所需的芳基异硫脲,并且可以耐受芳基硫脲和二芳基碘鎓盐上的多种官能团。该协议提供了一些潜在有用的生物和药物化合物的替代合成方法。
A Mild Synthesis of 2-Substituted Benzothiazoles via Nickel-Catalyzed Intramolecular Oxidative C–H Functionalization
A highly efficient synthetic method for the preparation of 2-aminobenzothiazoles starting from arylthioureas has been reported. By using a nickel catalyst, arylthioureas undergo intramolecular oxidative C-H bond functionalization, giving the desired 2-aminobenzothiazoles in good to excellent yields. This protocol features an inexpensive catalyst, low catalyst loading, mild reaction conditions, a short
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.