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Enamide tetra-substituted

It is assumed that the intermediate N-acyliminium ions formed from the Lewis acid-assisted ring opening of the isomiinchnone cycloadducts undergo rapid proton loss to produce tetra-substituted enamides. In the case of 65, this process is clearly evident as witnessed by the stereochemical outcome observed... [Pg.129]

Scheme 9.15 Asymmetric hydrogenation of tetra substituted cyclic enamides using the Ru catalyst containing Me DuPHOS or Me BPE. Scheme 9.15 Asymmetric hydrogenation of tetra substituted cyclic enamides using the Ru catalyst containing Me DuPHOS or Me BPE.
Rhodium catalyzed hydrogenation of enamides has attracted much attention recently. With the development of more efficient chiral phosphorus ligands, extremely high ee s can be obtained. Hydrogenation of tetra-substituted enamides, such as p,p-dimethyl-a-phenyl enamide derivative 56, has been reported with f-Bu-BisP and f-Bu-MiniPhos providing amide 57 with excellent ee.45... [Pg.58]

See other pages where Enamide tetra-substituted is mentioned: [Pg.27]    [Pg.808]    [Pg.867]    [Pg.13]    [Pg.36]    [Pg.160]    [Pg.292]    [Pg.76]    [Pg.613]    [Pg.166]    [Pg.166]    [Pg.252]    [Pg.615]   
See also in sourсe #XX -- [ Pg.270 , Pg.271 ]



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