Replacement of Stoichiometric DDQ with a Low Potential <i>o</i>-Quinone Catalyst Enabling Aerobic Dehydrogenation of Tertiary Indolines in Pharmaceutical Intermediates
作者:Bao Li、Alison E. Wendlandt、Shannon S. Stahl
DOI:10.1021/acs.orglett.9b00111
日期:2019.2.15
(phd = 1,10-phenanthroline-5,6-dione), is shown to be effective for aerobic dehydrogenation of 3° indolines to the corresponding indoles. The results show how low potential quinones may be tailored to provide a catalytic alternative to stoichiometric DDQ, due to their ability to mediate efficient substrate dehydrogenation while also being compatible with facile reoxidation by O2. The utility of the
过渡金属/醌配合物[Ru(phd)3] 2+(phd = 1,10-菲咯啉-5,6-二酮)被证明可有效地将3°二氢吲哚有氧脱氢成相应的吲哚。结果表明,由于低电位醌具有介导有效的底物脱氢的能力,并且还与通过O2进行的容易的再氧化兼容,因此如何定制低电位的醌以提供化学计量的DDQ的催化替代物。该方法的实用性在药学上重要分子的关键中间体的合成中得到了证明。