Isoquinoline Reissert salts 5 partake in novel cycloadditions with acetylenic aldehydes 11 giving novel oxazoles 14 which have been characterised by X-ray crystallography. In contrast, closely related phthalazine Reissert salts 6 and phenanthridine Reissert salts 15 react by an alternative pathway giving pyrrolo[2,1-a]phthalazines 12 and pyrrolo[1,2-f]phenanthridines 16 respectively.
A. W. Bridge, M. B. Hursthouse, C. W. Lehmann, D. J. Lythgoe and C. G. Newton, J. Chem. Soc., Perkin Trans. 1, 1993, 1839 DOI: 10.1039/P19930001839
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