10h phenothiazine

All experiments were carried out in an atmosphere of dry argon and flasks were flame dried. Solvents were dried by usual methods (diphenyl ether, diethyl ether and THF over benzophenone ketyl, CHCl₃ and CH₂Cl₂ over P₄O₁₀, hexane over sodium-potassium alloy) and distilled. Chromatographic purification was carried out on silica gel 60 (0.15–0.3 mm, Macherey-Nagel GmbH & Co. KG, Düren, Germany). Sodium hydride (dry, 95%), trimethyl orthoformate, triethyl orthoformate, triethyl orthoacetate, trimethyl orthoacetate, 1,10-phenanthroline (4n), 1,10-phenanthrolin-5-amine (5l), 9H-carbazole, pyrrolidine, 10H-phenothiazine, Meldrum’s acid, benzene-1,2-diamine, 4-fluorobenzene-1,2-diamine, 4-chlorobenzene-1,2-diamine, 4-bromobenzene-1,2-diamine, 4-methylbenzene-1,2-diamine, 3,4-diaminobenzonitrile and 3,4-diaminobenzoic acid were purchased from Sigma–Aldrich (Poznan, Poland), and were used without further purification.

All experiments were carried out in an atmosphere of dry argon, and flasks were flame dried. Solvents were dried by usual methods (diphenyl ether, diethyl ether, and THF over benzophenoneketyl, CHCl₃, and CH₂Cl₂ over P₄O₁₀, hexane, and pyridine over sodium-potassium alloy) and distilled. Chromatographic purification was carried out on silica gel 60 (0.15–0.3 mm, Macherey-Nagel GmbH & Co. KG, Dueren, Germany). Crotonaldehyde, 4a,12a-dihydro-12H-benzo[5,6][1,4]thiazino[2,3-b]quinoxaline, N¹,N¹-dimethylbenzene-1,4-diamine, 2,2-dimethylpropane-1,3-diol, 10H-phenothiazine, phosphoryl chloride, 2-isopropylaniline, isoquinolin-5-amine, quinolin-5-amine, sodium hydride (dry, 95%), stannous chloride, silver carbonate on Celite and o-toluidine were purchased from Sigma–Aldrich (Poznań, Poland), and were used without further purification.