A novel and efficient one-pot synthesis of tetrazole -derivatives such as Irbesartan and its analogues has been described from the primary acid amide derivatives. Thus 2-alkyl-3-[ P-( O-amidophenyl)benzyl]-1,3-diazaspiro[4.4]non-1-en-4-one derivatives or 4-[α-(acylamino)cyclopentamidomethyl]-2′-carboxamidobi-phenyl derivatives were treated with tributyltin chloride and sodium azide in O-xylene in the
The present invention provides an improved and commercially viable process for preparation of irbesartan intermediate, 1-[(2′-cyanobiphenyl-4-yl)methyl]-2-n-butyl-4-spirocyclopentane-2-imidazolin-5-one, substantially free of 1-[(2′-cyanobiphenyl-4-yl)methyl]-2-n-propyl-4-spirocyclopentane-2-imidazolin-5-one impurity, thereby producing irbesartan substantially free of the undesired propyl analog impurity, namely 2-propyl-3-[[2′-(1H-tetrazol-5-yl)[1,1′-biphenyl]-4-yl]methyl]-1,3 -diazaspiro[4.4]non-1-en-4-one. The present invention also provides a process for preparation of irbesartan substantially free of tin content. The present invention further provides a commercially viable process for preparation of irbesartan in high purity and in high yield.
Improved Methods for the Synthesis of Irbesartan, an Antihypertensive Active Pharmaceutical Ingredient
作者:Korrapati V. V. Prasada Rao、Ramesh Dandala、Vijay K. Handa、Inti V. Subramanyeswara Rao、Ananta Rani、Andra Naidu
DOI:10.1080/00397910701471279
日期:2007.8.1
[EN] PROCESS FOR PURE IRBESARTAN<br/>[FR] PROCÉDÉ DE PRODUCTION D'IRBÉSARTAN PUR
申请人:HETERO DRUGS LTD
公开号:WO2009072137A3
公开(公告)日:2009-09-24
MODULATION OF NEUROGENESIS WITH GABA AGENTS AND GABA ANALOGS
申请人:BARLOW Carrolee
公开号:US20110046090A1
公开(公告)日:2011-02-24
The instant disclosure describes methods for treating diseases and conditions of the central and peripheral nervous system by stimulating or increasing neurogenesis. The disclosure includes compositions and methods based on use of a GABA agent or GABA analog, in combination with one or more other neurogenic agents, to stimulate or activate the formation of new nerve cells.