作者:H.-J. Gais、K. Hafner、M. Neuenschwander
DOI:10.1002/hlca.19690520845
日期:——
Acetylenes having both electrondonating and electronaccepting groups (1) may be obtained in good yield from the correspondingly substituted olefines via bromination and elimination of HBr. The reaction of the acetylene aldehyde 1a with proton acids yields, after rearrangement of the primary adducts, the β-substituted acrylamides. Addition of nucleophiles leads to the β-disubstituted α.β-unsaturated
可以通过溴化和消除HBr,从相应取代的烯烃以高收率获得同时具有给电子基团和电子接受基团(1)的乙炔。乙炔醛1a与质子酸的反应在伯加合物重排后产生β-取代的丙烯酰胺。亲核试剂的加入导致β-二取代的α.β-不饱和羰基化合物。用肼得到吡唑和吡唑啉酮。乙炔1经历[2 + 2]-,[2 + 3]-和[2 + 4]-环加成反应。