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BUTLER, RN,GAVIN, HA,CUNNINGHAM, D,MCARDLE, P
1993
April
SUBSTITUTED 1-(2(1)-AMINOVINYL)PYRROLES AND PYRROLO[1,2-A]PYRAZINES FROM THE REACTION OF A PYRAZOLIUM METHANIDE 1,3-DIPOLE WITH DIALKYL ACETYLENEDICARBOXYLATES - A 1,2-CARBON TO NITROGEN REARRANGEMENT IN THE PYRAZOLE SYSTEM
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1
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AZOLIUM 1,3-DIPOLES CYCLOADDITION MECHANISM
Treatment of 1-ethoxycarbonylmethyl-2,3,4,5-tetraarylpyrazolium salts with base in the presence of dialkyl acetylenedicarboxylates provides a new route to substituted 1-(2(1)-aminovinyl)pyrroles and pyrrolo[1,2-a]pyrazines.
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884
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