Competitive [2,3]- and [1,2]-Oxonium Ylide Rearrangements. Concerted or Stepwise?
摘要:
The axial equatorial conformational isomer distribution of the reactant diazoacetoacetate or its metal carbene intermediate is reflected in Rh(II) catalyzed oxonium ylide forming reactions of 3-(trans-2-arylvinyl)tetrahydropyranone-5-diazoacetoacetates that afford diastereoisomeric products for both the symmetry-allowed [2,3)- and the formally symmetry-forbidden [1,2]-oxonium ylide rearrangements.
Cumulene photochemistry: photorearrangments of tetraphenyl and triphenyl C3 isomers
作者:Michael W. Klett、Richard P. Johnson
DOI:10.1021/ja00299a036
日期:1985.6
Photoreactions dans des solvants aprotiques du tetraphenylallene, du triphenylallene, des triphenyl-1,2,3- et -1,3,3-cyclopropenes. Description des isomeres de l'indene diversement substitues figurant parmi les photoproduits. Mecanisme
光反应 dans des solvants aprotiques du tetraphenylallene, du triphenylallen, des triphenyl-1,2,3- et -1,3,3-cyclopropenes。描述 des isomeres de l'indene 多样性替代 figurant parmi les photoproduits。机制
Regio- and Stereoselective Route to Tetrasubstituted Olefins by the Palladium-Catalyzed Three-Component Coupling of Aryl Iodides, Internal Alkynes, and Arylboronic Acids
作者:Chengxiang Zhou、Richard C. Larock
DOI:10.1021/jo048265+
日期:2005.5.1
The Pd-catalyzed three-component coupling of readily available aryl iodides, internalalkynes, and arylboronic acids provides a convenient, one-step, regio- and stereoselective route to tetrasubstitutedolefins in good to excellent yields, although electron-poor aryl iodides and dialkylalkynes normally afford only low yields under our standard reaction conditions. The proper combination of substrates
The reaction of 1-(disubstituted amino)-2,3-diphenylcyclopropenium salt with phenyl- and alkylmagnesium halides afforded, regioselectively, 1-aminocyclopropenes in good yields. The reactions of these 1-aminocyclopropenes were studied under acidic and nonacidic conditions to yield regioselective ring-opening products (C2–C3 and C1–C3 bond fissions of the cyclopropene) associated with the carbenium ions and carbene intermediates, respectively.
Novel isoquinoline derivatives which are useful as inhibitors of protein kinases for experimental, medical, and drug design purposes are disclosed. Preferred compounds which are specific inhibitors of protein kinase B are also disclosed. Furthermore, pharmaceutical compositions comprising these protein kinase inhibitors, and methods of using such compositions for treatment and diagnosis of cancers, diabetes, cardiovascular pathologies, hemorrhagic shock, obesity, inflammatory diseases, diseases of the central nervous system, and autoimmune diseases, are also disclosed.