stereoselective total synthesis of (+)-pentalenene was achieved through the tandem cycloaddition reaction of the allenyl diazo substrate prepared from (+)-citronellal. The initial intramolecular [2+3] cycloaddition reaction between the diazo functionality and the allenyl group produced the trimethylenemethane (TMM) intermediate after immediate loss of nitrogen molecule from the cycloaddition intermediate.
Provided is a novel compound represented by the following formula
Wherein each symbol is as defined in the specification, or a salt thereof, which has an angiotensin II receptor antagonistic activity and a peroxisome proliferator-activated receptor γ agonistic activity, and is useful as an agent for the prophylaxis or treatment of circulatory diseases such as hypertension and the like and/or metabolic diseases such as diabetes and the like, and the like.
Cyclization into Hydrindanones Using Samarium Diiodide
作者:Masakazu Sono、Yasuyo Nakashiba、Katsuyuki Nakashima、Motoo Tori
DOI:10.1021/jo9918450
日期:2000.5.1
Samarium(II) iodide has been employed to promote vinylogous pinacol coupling reaction of aldehyde onto alpha,beta-unsaturated ketones. The diastereoselectivity of 6-endo products was changed by addition of a proton source and/or HMPA and by the reaction temperature. The cyclizationreactions described herein provide a general approach to the syntheses of 3,3-dimethylhydrindanes with a cis-relationship
The present invention relates to isoquinolinone derivatives of formula (I): wherein are as herein defined; processes for their preparation, pharmaceutical compositions containing them and their use in therapy.
[EN] INDOLE DERIVATIVES AND PROCESS FOR THEIR PREPARATION<br/>[FR] DÉRIVÉS D'INDOLE ET PROCÉDÉ POUR LEUR PRÉPARATION
申请人:MERZ PHARMA GMBH & CO KGAA
公开号:WO2012055945A1
公开(公告)日:2012-05-03
Substituted indole derivatives of formula (I) wherein the radicals have e. g. the following meaning: R1 is hydrogen, -C1-6-alkyl, R2 is hydrogen, -C1-6-alkyl or cycloC3-12-alkyl; R3 is OR R4 is hydrogen or halogen, R5 is hydrogen, -C1-6-alkyl R6 is hydrogen, -C1-6-alkyl R is hydrogen or -C1-6-alkyl; X is a group -C(O)CH2- or -CH=CH-; R7 is hydrogen are potent inhibitors of Abeta peptide polymerization and can be used for the treatment of e.g. Alzheimers disease or ocular disorders.