3-Phenylpropionanilide (4a) is obtained in a yield of 89% from acrylanilide by the treatment with AlCl3/benzene, compared with a yield of 39% by the 1,4-conjugate addition of phenyllithium. The formation of 4a indicated that an intermolecular Friedel-Craftsreaction occurred, rather than the relatively more facile intramolecular ring cyclization, and provided a more efficient route than a conjugate
Processes for preparing 7-hydroxy-3,4-dihydro-2(1H)-quinolinone and the use in aripiprazole preparation thereof
申请人:Naddaka Vladimir
公开号:US20060079690A1
公开(公告)日:2006-04-13
The present invention provides improved processes for preparing the intermediate 7-hydroxy-3,4-dihydro-2(1H)-quinolinone (7-HQ), which may be used in preparing the drug aripiprazole. Among these processes are included three efficient processes for preparing 7-hydroxy-3,4-dihydro-2(1H)-quinolinone comprising reacting N-(3-methoxyphenyl)-3-chloropropionamide with AlCl
3
using novel reaction conditions thus obtaining a substantially pure product, which may be used in the subsequent steps for obtaining aripiprazole without further purification.