Platinum complex catalyzed synthesis of urea derivatives from nitroarenes and amines under carbon monoxide
作者:Yasushi Tsuji、Ryo Takeuchi、Yoshihisa Watanabe
DOI:10.1016/0022-328x(85)87437-4
日期:1985.7
aminoarenes at 140°C under carbon monoxide (initial 60 kg cm−2) in the presence of a catalytic amount of dichlorobis(triphenylphosphine)platinum(II), the yields of N,N′-diphenylurea, N,N′-bis(4-methylphenyl)urea, and N,N′-bis(4-chlorophenyl)urea were 65, 67 and 61%, respectively. Benzimidazole derivatives were obtained by the intramolecular cyclization reaction. An attempted synthesis of unsymmetric ureas
Ñ,Ñ -Diarylureas是在从硝基芳烃和aminoarenes良好的产率的一氧化碳(初始60公斤厘米下获得的在140℃ -2)在二氯双催化量存在(三苯基膦)铂(II),的产率Ñ,N′-二苯基脲,N,N′-双(4-甲基苯基)脲和N,N′-双(4-氯苯基)脲分别为65%,67%和61%。通过分子内环化反应获得苯并咪唑衍生物。尝试合成不对称脲导致形成对称和不对称产物的混合物。