Processes for preparing substituted aryl boronic acids
申请人:Pfizer Inc.
公开号:US20040038940A1
公开(公告)日:2004-02-26
The invention relates to processes for preparing a compound of the formula (V)
1
and alkyl boronic esters thereof wherein R
1
is attached at the 2 or 3 position of the benzene ring, R
2
is attached at the 5 or 6 position, and R
1
, R
2
and G are as defined herein. Said compound is a key synthetic intermediate in the preparation of 2-amino-6-(substituted-4-phenoxy)-substituted-pyridines useful as nitric oxide synthase (NOS) inhibitors in a mammal.
The invention relates to a convergent process for preparing a compound of the formula (V), wherein R
1
is attached at the 2 or 3 position of the benzene ring, R
2
is attached at the 5 or 6 position and R
1
, R
2
and G are as defined herein, in which an aryl boronic acid is coupled with an amine protected halo-substituted-2-aminopyridine using a palladium coupling agent. Compounds of formula V are useful as nitric oxide synthase (NOS) inhibitors in a mammal.
1