SCHEDULED MAINTENANCE
N-Ethyl-2-methoxyphenothiazine underwent formylation at the 3-position in the Vilsmeir–Haack reaction; the resulting aldehyde was condensed with aryl- and heteryl-acetonitriles to give acrylonitriles which were readily converted by pyridine hydrochloride into the 2-oxo-derivatives of the new heterocyclic system 2H-pyrano[6,5-b]phenothiazine.
N. P. Buu-Hoï, B. Lobert and G. Saint-Ruf, J. Chem. Soc. C, 1969, 2137 DOI: 10.1039/J39690002137
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