Process for preparing esters of 2-(6'methoxy-2'naphtyl)-propionic acid
申请人:Blaschim S.p.A.
公开号:US04414405A1
公开(公告)日:1983-11-08
Process for preparing esters of 2-(6'-methoxy-2'-naphtyl)-propionic acid via rearrangement of new ketals of 2-halo-1-(6'-methoxy-2'-naphtyl)-propan-1-one in the presence of a Lewis acid. The esters thus obtained are useful as intermediate products for preparing Naproxen. The process involves the preparation of the following new compounds: ketals of 2-halo-1-(6'-methoxy-2'-naphtyl)-propan-1-one esters of 2-(5'-bromo-6'-methoxy-2'-naphtyl)-propionic acid 1-(5'-bromo-6'-methoxy-2'-naphtyl)-propan-1-one 2-halo-(5'-bromo-6'-methoxy-2'-naphtyl)-propan-1-one.
Process for preparing esters of 2-(6'-methoxy-2'-naphtyl)-propionic acid via rearrangement of new ketals of 2-halo-1-(6'-methoxy-2'-naphtyl)-propan-1-one
申请人:BLASCHIM S.p.A.
公开号:EP0035305A2
公开(公告)日:1981-09-09
Process for prepanng esters of 2-(6'-methoxy-2'-naph- tyl)-propionic acid via rearrangement of new ketals of 2-halo-1-(6'-methoxy-2'-naphtyl)-propan-1-one in the presence of a Lewis acid.
The esters thus obtained are useful as intermediate products for preparing Naproxen.
The process involves the preparation of the following new compounds:
- ketals of 2-halo-1-(-methoxy-2'-naphtyl)-propan-1-one
- esters of 2-(5'-bromo-6' methoxy-2'-naphtyl)-propionic acid
- 1-(5'-bromo-6'-methoxy-2'-naphtyl)-propan-1-one
-2-halo-(5-bromo-6'-methoxy-2'-naphtyl)-propan-1- one
Process for preparing esters of alkanoic acids via rearrangement of alpha-haloketals
申请人:BLASCHIM S.p.A.
公开号:EP0034871A2
公开(公告)日:1981-09-02
Process for preparing esters of alkanoic acids via rearrangement of alpha-haloketals in the presence of a Lewis acid.
The reaction is preferably carried out in the presence of catalytic amounts of a Lewis acid and of a diluent at a temperature in the range from about 0° to the reflux temperature of the diluent.
The esters thus obtained are useful as intermediate products for preparing drugs.
The process involves the preparation of new alpha-haloketals.