SCHEDULED MAINTENANCE:
Isoquinolinium dialkoxycarbonyl ylides (I) and (II) and dimethyl acetylenedicarboxylate react in methanol to give the 1,10b-dihydropyrrolo[2,1-a]isoquinolines (IV) and (V); (I) and (II) in methanol alone yield the more reactive monoalkoxycarbonyl ylides (X) and dialkyl carbonate, the former dimerises to (XVII) or reacts in situ with olefins to yield 1,2,3,10b-tetrahydropyrrolo[2,1-a]isoquinolines.
N. S. Basketter and A. O. Plunkett, J. Chem. Soc., Chem. Commun., 1975, 594 DOI: 10.1039/C39750000594
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