Convergent synthesis of pyrrolidines, piperidines, perhydroazepines and tetrahydroisoquinolines via zirconocene η2-imine complexes
作者:Michael C.J. Harris、Richard J. Whitby、Julian Blagg
DOI:10.1016/0040-4039(95)00741-t
日期:1995.6
Zirconocene η2-imine complexes formed by a CH activation route from a variety of amines are trapped by ω-halo-alkenes or -alkynes to afford 2,3-disubstituited pyrrolidines, piperidines and perhydroazepines on work up and cyclisation. In some cases it was necessary to use a protected hydroxyl group rather than the halide and cyclise in a separate step through selective formation of the O-mesylate.
锆η 2层由CH活化途径由不同的胺形成亚胺的复合物由ω卤代烯烃被捕获或-alkynes,得到2,3- disubstituited吡咯烷,哌啶和perhydroazepines上的后处理和环化。在某些情况下,有必要在一个单独的步骤中通过选择性形成O-甲磺酸酯来使用受保护的羟基,而不是卤化物和环化。