Synthesis of Enantiopure <i>trans</i>-3,4-Disubstituted Piperidines. An Enantiodivergent Synthesis of (+)- and (−)-Paroxetine
作者:Mercedes Amat、Joan Bosch、José Hidalgo、Margalida Cantó、Maria Pérez、Núria Llor、Elies Molins、Carles Miravitlles、Modesto Orozco、Javier Luque
DOI:10.1021/jo991816p
日期:2000.5.1
undergo conjugate addition to give enantiopure trans-3,4-substituted 2-piperidone derivatives in high yield and stereoselectivity. The synthetic potential of this transformation is illustrated by the synthesis of (+)-femoxetine and the two enantiomers of the known antidepressant paroxetine.
(R)-苯基甘氨醇与5-氧戊酸甲酯反应生成双环内酰胺cis-1(动力学产物)或其异构体trans-1(在平衡条件下)为主要产物,将其转化为相应的(顺式或反式)不饱和内酰胺4和5。用烷基(或芳基)氰尿酸锂处理后,这些手性结构单元进行共轭加成,从而以高收率和立体选择性得到对映体反式3,4-取代的2-哌啶酮衍生物。(+)-非西西汀与已知抗抑郁药帕罗西汀的两种对映异构体的合成说明了这种转化的合成潜力。