2,2- and 2,6-Diarylpiperidines by Aryl Migration within Lithiated Urea Derivatives of Tetrahydropyridines
作者:Michael B. Tait、Sam Butterworth、Jonathan Clayden
DOI:10.1021/acs.orglett.5b00199
日期:2015.3.6
or carbolithiation led to migration of the N′-aryl substituent to the 2- or 6-position via intramolecular nucleophilic attack of a benzylic organolithium on the aryl ring. The products are a range of 2,2-, 2,2,3-, and 2,6-polysubstituted piperidine derivatives. Related chemistry was observed in pyrroline homologues.
通过阴离子环化或闭环复分解形成的2-芳基四氢吡啶被转化为其N'-芳基脲衍生物。取决于四氢吡啶环内不饱和的位置,通过去质子化锂化或碳锂化的金属化导致N'-芳基取代基经由芳基环上的苄基有机锂的分子内亲核攻击而迁移至2-或6-位。产物是2,2-,2,2,3-和2,6-多取代的哌啶衍生物的范围。在吡咯啉同源物中观察到相关化学。