Process for Producing Oseltamivir Phosphate and Intermediate Compound
申请人:Hayashi Yujiro
公开号:US20110082302A1
公开(公告)日:2011-04-07
Disclosed are a process suited to large scale synthesis with high yield for producing oseltamivir phosphate, in which a preparation of oseltamivir phosphate which is highly safe as a pharmaceutical product can be produced, and an intermediate compound for producing oseltamivir phosphate. In this production process, an intermediate compound represented by general formula (V) is synthesized by employing Michael reaction/Michael reaction/Horner-Wadsworth-Emmons reaction, and oseltamivir phosphate is produced by converting the substituent groups in this intermediate compound.
[EN] PROCESS FOR PRODUCING OSELTAMIVIR PHOSPHATE AND INTERMEDIATE COMPOUND<br/>[FR] PROCÉDÉ DE PRODUCTION DE PHOSPHATE D'OSELTAMIVIR ET COMPOSÉ INTERMÉDIAIRE
hetero-Diels-Alder reaction with electron-rich alkenes 4a-f or alkynes 9a-c under mild conditions, and phosphono-substituted pyrans 5a-d, 6e,f or pyranopyrans 11a-c were obtained in good to excellent yields. The reaction of 3 with cyclopentadiene and cyclohexadiene led to mixtures of [2 + 4] and [4 + 2] cycloadducts 7a, 8a and 7b, 8b in modest yields. The cycloaddition reaction between 3 and pyranopyran