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12-(N,N-Dialkylaminoalkyl)quino[1,4]benzothiazines 2c-2g were obtained by alkylation of 12H-quino[1,4]benzothiazines 2a and 2b with N,N-dialkylaminoalkyl chlorides in dioxane. 14H-Diquino [1,4]thiazine 4a was unreactive in the same conditions. 14-(N,N-Dialkylaminoalkyl)diquino[1,4]thiazines 4b-4d were synthesized in the annulation of 4,4′-dichloro-3,3′-diquinolinyl sulfide 3 with alkanediamines in hot phenol.
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