Iridium(III)- benzoxazolyl and benzothiazolyl phosphine ligands catalyzed versatile alkylation reactions with alcohols and the synthesis of quinolines and indole
作者:Shuang Huang、Si-Peng Wu、Quan Zhou、He-Zhen Cui、Xi Hong、Yue-Jian Lin、Xiu-Feng Hou
DOI:10.1016/j.jorganchem.2018.04.036
日期:2018.8
nyl) encountered ligands. The molecular structures of complexes 5c and 5e were crystallographically characterized. The dihedral angles of N (1)-C (1)-C (8)-C (9) showed an increasing twist compared with the corresponding ligand. The iridium (III) catalysts were screened, [Cp*IrCl2]2/4a proved to be the optimal catalyst, which exhibited efficient catalytic activity toward versatile alkylations including
合成并表征了一系列苯并恶唑基和苯并噻唑基膦配体4a-4g,其由可商购的2-氨基苯酚/ 2-氨基苯硫醇和2-溴苯甲醛经环化和磷酸化制备。通过单晶X射线衍射确定代表性的配体4c和4e。当[Cp * IrCl 2 ] 2(Cp * =五甲基环戊二烯基)遇到配体时,可以原位生成相应的铱配合物。配合物5c和5e的分子结构进行了晶体学表征。与相应的配体相比,N(1)-C(1)-C(8)-C(9)的二面角显示出增加的扭曲。筛选了铱(III)催化剂,证明[Cp * IrCl 2 ] 2 / 4a是最佳催化剂,它对包括酮,仲醇和与伯醇的胺在内的多种烷基化反应均显示出有效的催化活性。此外,在优化的条件下,通过分子间环化由酮与2-氨基苄醇合成喹啉,并通过分子内环化由2-(2-氨基苯基)乙醇合成吲哚。