Concise synthesis of trans- and cis-3,4-disubstituted piperidines based on regio- and stereoselective allylation of cyclopentenyl esters
作者:Junji Igarashi、Hiroyuki Ishiwata、Yuichi Kobayashi
DOI:10.1016/j.tetlet.2004.08.174
日期:2004.10
3,4-Disubstituted piperidines were synthesized through anti SN2′ allylation of 4-substituted 2-cyclopentenyl esters with reagents based on RMgX and CuX, thus allowing equal access to both trans- and cis-isomers. As an application, the paroxetine intermediate was synthesized efficiently. During the investigation, the MeOCH2CO2 group was found to show high reactivity in the pivotal anti SN2′ type reaction
3,4-二取代的哌啶是通过抗小号合成Ñ 2'的具有基于RMGX和的CuX试剂4-取代的2-环戊烯基酯烯丙基化,从而允许两者相等访问反式-和顺式-异构体。作为一种应用,高效合成了帕罗西汀中间体。在研究过程中,发现使用(i -PrO)Me 2 SiCH 2 MgCl和CuCN衍生的试剂,MeOCH 2 CO 2基团在关键的反S N 2'型反应中显示出高反应活性。