[GRAPHICS]Melanin-concentrating hormone (MCH) is implicated in the feeding behavior in mammals affording a potential target to control overeating in people. Compound 1 (AMG 076) has been identified as a potent MCHr1 antagonist for the treatment of obesity. A synthesis suitable for the large-scale preparation of this lead candidate was developed to support preclinical studies. A Robinson annulation of benzylpiperidone and resolution of the desired enone from a mixture of the diastereomers afforded key intermediate 6 after a stereoselective hydrogenation. Subsequent Fischer indole synthesis with hydrazine 5 then provided the advanced intermediate, indole 2. Two complementary reductive amination strategies employing either aldehyde 3 or lactol 4 led to the synthesis of title compound 1.
PROCESS FOR PREPARING GABAPENTIN
申请人:ZaCh System S.p.A.
公开号:EP2038249B1
公开(公告)日:2013-09-11
US8143443B2
申请人:——
公开号:US8143443B2
公开(公告)日:2012-03-27
[EN] PROCESS FOR PREPARING GABAPENTIN<br/>[FR] PROCÉDÉ DE PRÉPARATION DE LA GABAPENTINE
申请人:ZACH SYSTEM SPA
公开号:WO2008004115A1
公开(公告)日:2008-01-10
[EN] A process for preparing gabapentin of formula 1, which comprises Formula (I) converting 1-allyl-cyclohexanecarboxaldehyde into 1-allyl-cyclohexanecarbonitrile; ozonizing 1-allyl-cyclohexanecarbonitrile to obtain 1-cyano-cyclohexaneacetaldehyde; acetalizing 1-cyano-cyclohexaneacetaldehyde with a suitable acetalizing agent to give the corresponding acetal and converting the latter into gabapentin. [FR] La présente invention concerne un procédé de préparation de la gabapentine de formule 1, qui comprend (Formule (I)) la conversion de 1-allyl-cyclohexanecarboxaldéhyde en 1-allyl-cyclohexanecarbonitrile; l'ozonisation de 1-allyl-cyclohexanecarbonitrile pour obtenir 1-cyano-cyclohexaneacetaldéhyde; l'acétalisation de 1-cyano-cyclohexaneacetaldéhyde au moyen d'un agent acétalisant approprié pour donner l'acétal correspondant et convertir ce dernier en gabapentine.