The present invention relates to compounds and compositions useful in modulating the renin-angiotensin system (RAS) in cells, and in particular to compounds which, inter alia, act as angiotensin II antagonists by binding to angiotensin II receptors. The invention also relates to the use of these compounds and compositions in the treatment of conditions responsive to angiotensin II antagonists such as hypertension, edema, renal failure, benign prostatic hypertrophy glaucoma, atherosclerosis, diabetes, Alzheimer's disease and congestive heart failure.
Process for the preparation of angiotensin receptor blockers and intermediates thereof
申请人:Joshi Shriram Narendra
公开号:US20060211866A1
公开(公告)日:2006-09-21
A process for the preparation of a biphenyl-containing compound of general formula I:
wherein R
1
is a C
3-6
carbonyl containing compound; R
2
is a substituted or unsubstituted, straight or branched C
3-6
alkyl group, or R
1
and R
2
together with the nitrogen atom to which they are bonded are joined together to form a substituted heterocyclic group selected from the group consisting of substituted or unsubstituted imidazoles, substituted or unsubstituted benzimidazoles and substituted or unsubstituted 1,3-diazaspiro[4,4]non-1-en-4-one; and R
3
is a carboxylic acid ester, cyano, a substituted or unsubstituted 1H-tetrazolyl group or a substituted or unsubstituted group which may be converted in vivo into a carboxy group is provided, the process comprising reacting a compound of general formula II:
wherein R
1
and R
2
have the aforestated meanings with a compound of general formula III:
wherein Z is a leaving group and R
3
has the aforestated meaning in a biphasic solvent system in the presence of a phase transfer catalyst.
Provided are a method of making irbesartan via a Suzuki coupling reaction and a novel intermediate, 2-butyl-3-(4′-bromobenzyl)-1,3-diazaspiro[4,4]non-1-ene-4-one, for such process. The novel process includes the step of reacting such intermediate with a protected imidazolephenylboronic acid.
A process for the synthesis of tetrazol derivative has been developed which starts from a tetrazole derivative where acidic hydrogen atom has been replaced by a protecting group and the deprotection is performed with a catalytic amount of organic acid and can proceed in an aqueous solvent.