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Intramolecular cycloadditions nitrile imines

Meier and Heimgartner (208) achieved an intramolecular sydnone-alkene cycloaddition to give adduct 306 in 50% yield. Other tether lengths did not so react, but photolysis of these other sydnones led to novel fused pyrazoles via decarboxylation and subsequent cycloadditions from the subsequent nitrile-imines. [Pg.737]

Over the last 25 years both nitrile ylides and nitrile imines have continued to provide fascinating and synthetically useful chemistry. In both cases, the exploitation of [3 + 2]-cycloaddition chemistry with an increasing range of dipolarophiles has continued as a key route to five-membered heterocycles. The major development of new chemistry, however, has been in the extensive exploration of intramolecular reactions both in cycloaddition chemistry and in the electrocycliza-tion of 1,3-dipoles with extended conjugation. Such chemistry harnesses the unique reactivity of 1,3-dipoles in the synthesis of relatively elaborate structures but does require the design and preparation of quite complex reactants containing both the 1,3-dipole precursor and the dipolarophilic component. However, access to this chemistry is becoming much easier via the application of new synthetic procedures... [Pg.454]


See other pages where Intramolecular cycloadditions nitrile imines is mentioned: [Pg.317]    [Pg.473]    [Pg.511]    [Pg.525]    [Pg.530]    [Pg.163]    [Pg.107]    [Pg.1165]    [Pg.397]    [Pg.435]    [Pg.449]   
See also in sourсe #XX -- [ Pg.511 , Pg.512 , Pg.513 , Pg.514 , Pg.515 ]

See also in sourсe #XX -- [ Pg.511 , Pg.512 , Pg.513 , Pg.514 , Pg.515 ]




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1,3-cycloaddition intramolecular

Imine 2+2] cycloaddition

Imines cycloadditions

Imines intramolecular

Nitrile imine

Nitrile imines cycloaddition

Nitrile imines cycloadditions

Nitriles cycloaddition

Nitriles cycloadditions

Nitriles intramolecular

Stereoselectivity nitrile imine intramolecular cycloadditions

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