Catalytic iron-mediated ene carbocyclizations of trienes: The stereoselecitve preparation of N-acylpiperidines
作者:Beckie E. Takacs、James M. Takacs
DOI:10.1016/0040-4039(90)80168-l
日期:1990.1
6-aza-(3Z,9E)-3,9,11-dodecatriene derivatives, substrates containing a nitrogen atom in the chain connecting the 1,3-diene and alkene functionalities, undergo efficient, stereoselective [4+4]-ene carbocyclization to yield trans-disubstituted N-acylpiperidines. In contrast, the corresponding (2Z,8Z)-diastereonmer yields predominantly the corresponding cis isomer.
5-和6-氮杂-(2Z,8E)-2,8,10-十二碳三烯和6-氮杂-(3Z,9E)-3,9,11-十二碳三烯衍生物,在连接的链中包含氮原子的底物1,3-二烯和烯烃官能团经过有效的,立体选择性的[4 + 4]-烯碳环化反应,生成反式-二取代的N-酰基哌啶。相反,相应的(2Z,8Z)-非对映异构体主要产生相应的顺式异构体。