L. Strekowski et al., A SYNTHETIC ROUTE TO 3-(DIALKYLAMINO)PHENOTHIAZIN-5-IUM SALTS AND 3,7-DISUBSTITUTED DERIVATIVES CONTAINING 2 DIFFERENT AMINO-GROUPS, Journal of heterocyclic chemistry, 30(6), 1993, pp. 1693-1695
Phenothiazin-5-ium tetraiodide hydrate (2), the suggested oxidation pr
oduct of phenothiazine with iodine, is treated with two equivalents of
a dialkylamine to give 3-(dialkylamino)phenothiazin-5-ium triiodides,
3-6. 3,7-Disubstituted phenothiazin-5-ium iodides, 7-9, are obtained
by the reaction of 3-6 with an amine.