CPC C07D 285/15 (2013.01) | 19 Claims |
1. A one-pot process for preparing 3,7-bis(dimethylamino)phenothiazin-5-ylium iodide, the process using phenothiazine as a starting product and comprising the following steps:
a) treating phenothiazine with diiodine, and
b) treating the reaction medium directly resulting from step a) with dimethylamine,
wherein, in step b), the dimethylamine is introduced into the reaction medium in the form of a solution in water, or a mixture of water with one or more of methanol, ethanol, or tetrahydrofuran.
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