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。
An Efficient Chan-Lam <i>S</i>
-Arylation of Arylthioureas with Arylboronic Acids
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
Nickel(II) complexes of di- and tri-substituted thiourea mono- and di-anions
作者:Ho Ying Yuen、William Henderson、Allen G. Oliver
DOI:10.1016/j.ica.2010.12.011
日期:2011.3
Abstract Reaction of nickel(II) acetate, 1,2-bis(diphenylphosphino)ethane (dppe), and a di- or tri-substituted thiourea R1NHC(S)R2R3 (R3 = H or alkyl) with trimethylamine in hot methanol gave cationic nickel(II) complexes containing N,S-chelated thiourea monoanion ligands [NiSC(NR2R3)NR1}(dppe)]+, which can be readily isolated as their BPh4− salts. The X-ray crystal structure of [NiSC(NMe2)NPh}(dppe)]+BPh4−
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.