135050-95-2Relevant articles and documents
Preparation method of olmesartan medoxomil
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Paragraph 0033; 0034; 0035; 0036; 0037; 0038, (2017/02/09)
The invention discloses a preparation method of olmesartan medoxomil. The preparation method comprises the following steps of using 4-bromobenzaldehyde as a starting raw material, performing Suzuki coupling reaction with 2-(2'-triphenylmethyl tetrazole-5-yl)borophenylic acid (III), and reducing by NaBH4 (sodium borohydride), so as to obtain an olmesartan medoxomil intermediate of N-triphenylmethyl-5-(4'-hydroxymethyl biphenyl-2-yl)tetrazole (IV); directly reacting the intermediate (IV) and 2-propyl-4-(1-hydroxy-1-methylethyl)imidazole-5-carboxylic acid ethyl ester, so as to obtain a compound VI; performing hydrolysis, esterification and deprotection, so as to obtain the olmesartan medoxomil. Compared with the prior art, the preparation method has the advantages that the obtaining of raw materials is easy, the amount of byproducts is fewer, the reaction line is shortened, the reaction condition is mild, the operation is simple, the total yield of product is improved, and the preparation method is suitable for industrialized production.
PROCESS FOR PREPARING BIPHENYLTETRAZOLE COMPOUNDS
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, (2008/06/13)
Method for the preparing biphenyltetrazole compounds which are angiotensin II receptor antagonists or which are useful intermediates to prepare angiotensin II receptor antagonists. An illustrative biphenyl tetrazole compound is 2-n-butyl-4-chloro-1-[(2'-(tetrazol-5-yl)-1,1'-biphenyl-4-yl)methyl]-1H-imi dazole-5-methanol, potassium salt.