Methods for the preparation of benzophenones derivatives
申请人:F. HOFFMANN-LA ROCHE AG
公开号:EP0855379A1
公开(公告)日:1998-07-29
The present invention relates to a process for the manufacture of benzophenone derivatives and is based on the separation of compounds of formula (I),
from corresponding isomeric compounds of formula (II),
by selective crystallization of corresponding salts of compounds of formula (I).
Convenient Synthesis of Tolcapone, a Selective Catechol‐<i>O</i>‐methyltransferase Inhibitor
作者:Govindarajan Manikumar、Chunyang Jin、Kenneth S. Rehder
DOI:10.1080/00397910701821077
日期:2008.2.13
A convenient and efficient synthesis of tolcapone from commercial 4-benzyloxy-3-methoxybenzaldehyde is presented. Grignard reaction of 4-benzyloxy-3-methoxybenzaldehyde (1) with p-tolylmagnesium bromide followed by Oppenauer oxidation of the hydroxyl functionality and subsequent O-debenzylation gave phenol 5. Compound 5 was regioselectively nitrated and then subjected to O-demethylation to produce tolcapone in 60% overall yield.
3,5-Disubstituierte Pyrocatecholderivate
申请人:F. HOFFMANN-LA ROCHE AG
公开号:EP0237929B1
公开(公告)日:1993-06-02
Methods for the preparation of benzophenone derivatives