Isoquinolinium ylides react with dimethyl acetylenedicarboxylate to yield 2,3-dihydrobenzo[g]-indolizines and the corresponding benzo[g]indolizines, whilst with methyl propiolate only the latter are obtained.
N. Basketter and A. O. Plunkett, J. Chem. Soc. D, 1971, 1578 DOI: 10.1039/C29710001578
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