作者:Steven W. M. Crossley、Francis Barabé、Ryan A. Shenvi
DOI:10.1021/ja5105602
日期:2014.12.3
Catalytic amounts of Co(SaltBu,tBu)Cl and organosilane irreversibly isomerize terminal alkenes by one position. The same catalysts effect cycloisomerization of dienes and retrocycloisomerization of strained rings. Strong Lewis bases like amines and imidazoles, and labile functionalities like epoxides, are tolerated.
Pyrazolopyridine cycloalkanones and process for their preparation
申请人:ICI Americas Inc.
公开号:US04546104A1
公开(公告)日:1985-10-08
Novel tetrahydropyrazolo-[3,4-b]quinolinones, cyclopenta[b]pyrazolo-[4,3-e]pyridinones and cyclohepta[b]-pyrazolo[4,3-e]pyridinones, useful as anxiolytics having reduced side effects, are disclosed, including methods of preparation, pharmaceutical compositions containing them and intermediates used in their preparation.
Photoinduced electron transfer (PET) reactions of α-cyclopropyl-substituted ketones and triethylamine (TEA) were used to initiate the cyclopropylcarbinyl-homoallyl rearrangement. The intramolecular cyclization reaction onto triple bonds was performed yielding bicyclic and spirocyclic compounds. Furthermore, in some preliminary studies it was shown that even intramolecular aromatic substitutions are
Rhodium-Catalyzed Arylative and Alkenylative Cyclization of 1,5-Enynes Induced by Geminal Carbometalation of Alkynes
作者:Yiyun Chen、Chulbom Lee
DOI:10.1021/ja067125+
日期:2006.12.1
formation of a rhodiumvinylidenecomplex with the terminal alkyne of the enyne substrate. The subsequent migration of the aryl or alkenyl group from the rhodium center to the alpha-carbon of the vinylideneligand gives a vinylrhodiumcomplex, a formal 1,1-carbometalation process of the alkyne. This vinylrhodium then adds to the pendent alkene, and the protodemetalation of the resulting rhodium enolate
Novel tetrahydropyrazolo-[3,4-b]quinolinones, cyclo- benta[b]pyrazolo-[4,3-e]pyridinones and cyclohepta[b]-pyraz- olo-[4,3-e]pyridinones are disclosed useful as anxiolytics hav- ng reduced side effects are disclosed, including methods of preparation, pharmaceutical compositions containing them and intermediates used in their preparation.