Treatment of procularine A (4a) with sulphuric acid, followed by methylation, gave an abnormal product, 1,9,10-trimethoxyaporphine (5), which was also obtained similarly from procularine B (4b).
T. Kametani, K. Fukumoto and M. Fujihara, J. Chem. Soc., Perkin Trans. 1, 1972, 394 DOI: 10.1039/P19720000394
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