To a mixture of 7-(2-chloroethoxy)-1-phenyl-1,2-dihydro[1,4]oxazino[2,3,4-jk]carbazole (0.412 g, 1.13 mmol) in dry DMF (10 mL) is added N-methyl piperazine (0.125 mL, 1.13 mmol), sodium iodide (0.17 g, 1.13 mmol), and potassium carbonate (0.312 g, 2.26 mmol). The mixture is heated at 85° C. for 20 h. The mixture is then cooled and partitioned between water and CH2Cl2. The organic layer is separated and washed twice with water (200 mL), dried over anhydrous sodium sulfate and concentrated. Column chromatography (50 mL silica) using CH3OH/CH2Cl2 (8/92) with 2 drops per 100 mL of NH4OH gave 0.156 g (32%) of 2-(4-methyl-1-piperazinyl)ethyl 1-phenyl-1,2-dihydro[1,4]oxazino[2,3,4-jk]carbazol-7-yl ether; mp 57° C.
