<i>N</i>-phenyl-substituted pyrrolidines, piperidines and azabicyclics by a tandem reduction-double reductive amination reaction
作者:Richard A. Bunce、Derrick M. Herron、Jason R. Lewis、Sharadsrikar V. Kotturi
DOI:10.1002/jhet.5570400115
日期:2003.1
formed in high yield and are easily purified. The method has also been extended to the synthesis of fused N-phenylazabicyclics from 2-(3-oxo-propyl)cycloalkanones. A high degree of diastereoselectivity for the trans-fused product is observed in substrates having an ester group α to the cycloalkanone carbonyl. Bicyclic precursors lacking this ester group give mixtures of cis and trans products. Finally
通过分别在4-和5-氧醛的存在下催化还原硝基苯来合成N-苯基取代的吡咯烷和哌啶。该方法包括还原芳族硝基以得到N-苯基羟胺或苯胺,然后用两个羰基官能团进行还原胺化。单环体系通常以高收率形成并且易于纯化。该方法还扩展到由2-(3-氧代-丙基)环烷酮合成稠合的N-苯基氮杂双环。在具有相对于环烷酮羰基的酯基为α的底物中,观察到对转熔产物的高度非对映选择性。缺少该酯基的双环前体可得到顺式和反式产品。最后,与以前的报道相反,我们证明了在这些反应中苯胺可以代替硝基苯。