Binap-silver salts as chiral catalysts for the enantioselective 1,3-dipolar cycloaddition of azomethine ylides and alkenes
作者:Juan Mancebo-Aracil、María Martín-Rodríguez、Carmen Nájera、José M. Sansano、Paulo R.R. Costa、Evanoel Crizanto de Lima、Ayres G. Dias
DOI:10.1016/j.tetasy.2012.10.015
日期:2012.12
Binap-AgSbF6 catalyzed 1,3-dipolar cycloadditions between azomethine ylides and electrophilic alkenes are described and compared with analogous transformations mediated by other Binap-silver(I) salt complexes. Maleimides and 1,2-bis(phenylsulfonyl)ethylene are suitable dipolarophiles for obtaining very good enantioselectivities, even better values are generated by a multicomponent version. There are
描述了Binap-AgSbF 6催化的甲亚胺烷基化物和亲电子烯烃之间的1,3-偶极环加成反应,并将其与其他Binap-银(I)盐配合物介导的类似转化进行了比较。马来酰亚胺和1,2-双(苯磺酰基)乙烯是获得非常好的对映选择性的合适的双亲亲油性,甚至通过多组分形式产生更好的对映选择性。二磺酰化的环加合物在顺式2,5-二取代的吡咯烷,天然产物的前体或抗病毒化合物的合成中有价值的中间体的总合成中有一些非常有趣的应用。