Effect of the aryl group substituent in the dimerization of 3-arylisoxazoles to syn 2,6-diaryl-3,7-diazatricyclo[4.2.0.02,5]octan-4,8-diones induced by LDA
摘要:
3-Arylisoxazoles react with LDA in THF at 0 degrees C affording syn-2,6-diaryl-3,7-diazatricyclo[4.2.0.0(2,5)]octan-4,8-diones (bis-azetidinones), via stereoselective dimerization of an azetinone anion intermediate. A fragmentation reaction affording arylnitriles may compete with electronic and steric effects of the substituent present in the aryl group being pivotal in determining the outcome of this reaction. An interesting behaviour with LDA of arylnitriles arising from the fragmentation reaction of some 3-arylisoxazoles was also observed. N,N-Diisopropylaminobenzonitriles were in fact formed (plausibly via a benzyne mechanism) from 3-(4-chlorophenyl)isoxazole and 3-(2-chlorophenyl)isoxazole, whereas 3-(2-methylphenyl)isoquinolin-1-amine was isolated starting from 3-(2-methylphenyl)isoxazole and LDA. (C) 2008 Elsevier Ltd. All rights reserved.
The invention provides compounds of formula
in which R
1
, R
2
, R
3
and R
4
have the meanings defined in the specification; processes for their preparation; pharmaceutical compositions containing them; a process for preparing the pharmaceutical compositions; and their use in therapy.
[EN] NOVEL PIPERAZINE DERIVATIVES<br/>[FR] NOUVEAUX DERIVES DE LA PIPERAZINE
申请人:ACTELION PHARMACEUTICALS LTD
公开号:WO2007034445A2
公开(公告)日:2007-03-29
[EN] The invention relates to novel piperazine derivatives and related compounds and their use as active ingredients in the preparation of pharmaceutical compositions. The invention also concerns related aspects including processes for the preparation of the compounds, pharmaceutical compositions containing one or more of those compounds and especially their use as inhibitors of renin. [FR] L'invention concerne de nouveaux dérivés de la pipérazine et des composés associés ainsi que leur utilisation en tant qu'ingrédients actifs dans la préparation de compositions pharmaceutiques. L'invention concerne également des aspects associés comprenant des procédés de préparation desdits composés, des compositions pharmaceutiques renfermant au moins un de ces composés et en particulier, leur utilisation comme inhibiteurs de la rénine.