138402-10-5Relevant articles and documents
Synthesis of amido-N-imidazolium salts and their applications as ligands in suzuki-miyaura reactions: Coupling of hetero- aromatic halides and the synthesis of milrinone and irbesartan
Kumar, Manian Rajesh,Park, Kyungho,Lee, Sunwoo
scheme or table, p. 3255 - 3266 (2011/02/23)
A new catalytic system based on palladium-amido-N-heterocyclic carbenes for Suzuki-Miyaura coupling reactions of heteroaryl bromides is described. A variety of sterically bulky, amido-N-imidazolium salts were synthesized in high yields from the corresponding anilines. This catalytic system effectively promoted Suzuki-Miyaura couplings of heteroaryl bromides and chlorides with a range of boronic acids to give the corresponding aryl compounds in high yield. The yield was increased with increasing steric bulkiness of the substituted group. Especially, 1-(2,6-diisopropylphenyl)-3-N-(2,4,6-tri-tert- butylphenylacetamido)imidazolium bromide (4bc) exhibited 850,000 TON in the coupling reaction of 2-bromopyridine and phenylboronic acid. In addition, pharmaceutical compounds such as milrinone and irbesartan were synthesized via Suzuki-Miyaura coupling using sterically bulky, amido-N-imidazolium salt (4bc) as a ligand. Copyright
PROCESS FOR THE PREPARATION OF IRBESARTAN AND INTERMEDIATE PRODUCTS
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Page/Page column 13, (2010/01/07)
The present invention relates to a new method for the production of irbesartan, having the chemical name 2-n-butyl-4-spirocyclopentane-1-[(2'-(tetrazol-5-yl)biphenyl-4-yl)methyl]-2- imidazolin-5-one, and pharmacologically acceptable salts thereof. Furthermore the invention relates to new (intermediate) compounds which are suitable for the production of irbesartan.
PROCESSES FOR THE SYNTHESIS OF 5-PHENYL -1 TRITYL-1H-TETRAZOLE
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Page/Page column 17, (2010/11/30)
Provided are processes for the synthesis of 5 -phenyl- 1-trityl-lH-tetrazole, an intermediate useful in the synthesis of irbesartan.