Cycloauration of substituted 2-phenoxypyridine derivatives and X-ray crystal structure of gold, dichloro[2-[[5-[(cyclopentylamino)carbonyl]-2-pyridinyl-κN]oxy]phenyl-κC]-, (SP-4-3)-
作者:Yongbao Zhu、Beth R. Cameron、Renato T. Skerlj
DOI:10.1016/s0022-328x(03)00347-4
日期:2003.7
2-phenoxypyridines with different substituents at the 5-position of the pyridine ring was carried out in an CH3CN/H2O medium, leading to isolation of cycloaurated compounds AuCl2(L) (HL=substituted 2-phenoxypyridine ligand) with alkyl, substituted alkyl, phenyl, halo, ester and amido groups. The preparation of cycloaurated compounds involves the formation of an intermediate AuCl3(HL) via coordination reaction between
在CH 3 CN / H 2 O介质中对吡啶环5位上具有不同取代基的2-苯氧基吡啶进行直接环化,从而分离出环化化合物AuCl 2(L)(HL =取代的2-苯氧基吡啶配体)具有烷基,取代的烷基,苯基,卤素,酯基和酰胺基。化合物的制备包括在室温下通过吡啶配体与NaAuCl 4的配位反应形成中间体AuCl 3(HL),然后在高温下在CH 3 CN / H 2中形成Au-C键。哦,中等。庞大的亲脂性基团的存在降低了环化化合物的收率,并有利于反应物种分解成Au(0)。对于在吡啶环中具有强吸电子取代基(硝基或腈)的配体,未观察到配位反应。具有供电子二甲基氨基的配体在室温下被NaAuCl 4氧化。噻吩基或乙酰基的存在允许分离中间体AuCl 3(HL),但对随后的循环auauration有不利影响。甲基取代的2-苯氧基吡啶配体的直接环金原子化的结果表明,在吡啶环中最靠近Au-N(py)键的6位甲基的存在导