Functionalized 7H-pyrrolo[1,2-a]imidazoles (2) are obtained directly by a novel double transacylation reaction of 1-acylimidazoles (1) with dimethyl acetylenedicarboxylate (DMAD); the structure of one of the products (2b) has been determined by X-ray crystallography.
H. Knölker and R. Boese, J. Chem. Soc., Perkin Trans. 1, 1990, 1821 DOI: 10.1039/P19900001821
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