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Intramolecular cycloadditions miinchnone cycloaddition reactions

The reaction of the mesoionic miinchnones with alkynes affords pyrroles. The azlactones afford A(-unsubstituted pyrroles. If the azlactones are treated with a strong alkylating agent such as methyl trifluoromethylsulfonate or triethyloxonium tetrafluoroborate in the presence of 2,6-di-/-butylpyridine and the alkyne, TV-substituted pyrroles are obtained <88S999>. Pyrroles with an N-alkyl substituent that contains a reactive group, such as a bromine atom, may be prepared by this method (Equation (6)). An intramolecular 1,3-dipolar cycloaddition of an alkyne with a mflnchnone affords a fused pyrrole (Scheme 31) <89JCS(Pi)36i>. [Pg.285]

See other pages where Intramolecular cycloadditions miinchnone cycloaddition reactions is mentioned: [Pg.249]    [Pg.709]    [Pg.720]    [Pg.586]    [Pg.209]    [Pg.111]   
See also in sourсe #XX -- [ Pg.710 , Pg.711 , Pg.712 , Pg.713 , Pg.714 , Pg.715 , Pg.716 , Pg.717 , Pg.718 , Pg.719 , Pg.720 , Pg.721 , Pg.722 , Pg.723 , Pg.724 ]

See also in sourсe #XX -- [ Pg.710 , Pg.711 , Pg.712 , Pg.713 , Pg.714 , Pg.715 , Pg.716 , Pg.717 , Pg.718 , Pg.719 , Pg.720 , Pg.721 , Pg.722 , Pg.723 , Pg.724 ]



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