Dienol-Benzol-Umlagerung von Penta-2,4-dienyl-benzocyclohexadinolen
摘要:
1-羟基-2-甲基-2-(戊-2,4-二烯基)-1,2-二氢萘(2),在乙醚中于0° C用0.75N H 2 SO 4处理,经过[1 s,2 s ]-σ重排,得到2-甲基-1-(戊-2,4-二烯基)-萘(5),参见。方案2。在相同条件下,2-羟基-1-甲基-1-(戊-2,4-二烯基)-1,2-二氢萘(4)产生38%的[1 s,2 s ]产物1-甲基- 2-(戊-2,4-二烯基)萘(6),与26%1-甲基萘,21%1-甲基-4-(戊-2,4-二烯基)萘(7)和1%1-甲基-5-(戊-2,4-二烯基)-萘(8),参见。方案2。后两种萘衍生物很可能至少是分子间过程的产物。
Activation of 1,1-Difluoro-1-alkenes with a Transition-Metal Complex: Palladium(II)-Catalyzed Friedel–Crafts-Type Cyclization of 4,4-(Difluorohomoallyl)arenes
摘要:
Cationic palladium(II) ([Pd(MeCN)(4)](BF4)(2)) provides the first transition-metal-catalyzed method for electrophilic activation of electron-deficient 1,1-difluoro-1-alkenes, which allows their Friedel-Crafts-type cyclization with an intramolecular aryl group via a Wacker-type process. By using BF3 center dot OEt2, the cyclization was effected by a catalytic amount of the palladium without its reoxidation.
acceptor-less dehydrogenative coupling (ADC) of alcohols resulted in the synthesis of a series of important α,β-unsaturated functionalized ketones, having aryl, heteroaryl, alkyl, nitro, nitrile and trifluoro-methyl, as well as halogen moieties, with excellent yields and selectivity. Initial mechanistic studies, including deuterium labeling experiments, determination of rate and order of the reaction, and quantitative
[EN] BENZOPYRAN AND BENZOTHIOPYRAN DERIVATIVES HAVING RETINOID ANTAGONIST-LIKE ACTIVITY<br/>[FR] DERIVES DE BENZOPYRANE ET BENZOTHYOPYRANE PRESENTANT UNE ACTIVITE RETINOÏDE DE TYPE ANTAGONISTE
申请人:ALLERGAN SALES, INC.
公开号:WO1999033821A1
公开(公告)日:1999-07-08
(EN) 2,2-Dialkyl- 4-aryl-substituted benzopyran and benzothiopyran derivatives of formula (I) where the symbols have the meaning described in the specification, have retinoid negative hormone and/or antagonist-like biological activities. The invented RAR antagonists can be administered to mammals, including humans, for the purpose of preventing or diminishing action or RAR agonists on the bound receptor sites. Specifically, the RAR agonists are administered or coadministered with retinoid drugs to prevent or ameliorate toxicity or side effects caused by retinoids or vitamin A or vitamin A precursors. The retinoid negative hormones can be used to potentiate the activities of other retinoids and nuclear receptor agonists.(FR) L'invention concerne des dérivés de 2,2-dialkyl-benzopyrane et benzothiopyrane à substitution 4-aryl de formule (I), dont les symboles sont définis dans le descriptif. Ces dérivés présentent des activités biologiques rétinoïdes de type antagonistes et/ou hormones négatives. Les antagonistes de RAR de l'invention peuvent être administrés aux mammifères, y compris aux humains, pour prévenir ou réduire l'action d'antagonistes de RAR sur les sites récepteurs liés. En particulier, les agonistes de RAR sont administrés ou co-administrés avec des médicaments rétinoïdes pour empêcher ou atténuer la toxicité ou les effets secondaires des rétinoïdes, de la vitamine A ou des précurseurs de la vitamine A. Les hormones négatives rétinoïdes peuvent être utilisées pour renforcer les activités d'autres rétinoïdes et celles d'agonistes de récepteurs nucléaires.
Synthesis and use of retinoid compounds having negative hormone and/or antagonist activities
申请人:——
公开号:US20030219832A1
公开(公告)日:2003-11-27
Aryl-substituted and aryl and (3-oxo-1-propenly)-substituted benzopyran, benzothiopyran, 1,2-dihydroquinoline, and 5,6-dihydronaphthalene derivatives have retinoid negative hormone and/or antagonist-like biological activities. The invented RAR antagonists can be administered to mammals, including humans, for the purpose of preventing or diminishing action of RAR agonists on the bound receptor sites. Specifically, the RAR agonists are administered or coadministered with retinoid drugs to prevent or ameliorate toxicity or side effects caused by retinoids or vitamin A or vitamin A precursors. The retinoid negative hormones can be used to potentiate the activities of other retinoids and nuclear receptor agonists. For example, the retinoid negative hormone called AGN 193109 effectively increased the effectiveness of other retinoids and steroid hormones in in vitro transactivation assays. Additionally, transactivation assays can be used to identify compounds having negative hormone activity. These assays are based on the ability of negative hormones to down-regulate the activity of chimeric retinoid receptors engineered to possess a constitutive transcription activator domain.