Synthesis of enantioenriched azo compounds: organocatalytic Michael addition of formaldehyde N-tert-butyl hydrazone to nitroalkenes
作者:David Monge、Silvia Daza、Pablo Bernal、Rosario Fernández、José M. Lassaletta
DOI:10.1039/c2ob26963e
日期:——
moderate enantioselectivities, up to 84 : 16 er; additional transformation of diazenes into their tautomeric hydrazones proved to be operationally simple and high-yielding, affording bifunctional compounds which represent useful intermediates for the synthesis of enantioenriched β-nitro-nitriles and derivatives thereof.
前所未有的重氮烯反应 甲醛N-叔丁基轴向手性双硫脲可以有效地催化硝基烯烃的合成,从而提供相应的二氮烯,收率好至极好(60-96%),中等对映体选择性,最高可达84:16 er。已证明将二氮杂化合物向其互变异构的另外转化是操作简单且高产率的,提供了双官能化合物,其代表用于合成对映体富集的β-硝基腈及其衍生物的有用的中间体。