Methyl chloroformate → 3-Acetyl-2-methyl-4-phenyl-5,8-dihydro-6H-9-thia-1,7-diaza-fluorene-7-carboxylic acid-methyl ester

참여 물질

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To a stirred solution of 50 mg (0.15 mmol) 1-(2-methyl-4-phenyl-5,6,7,8-tetrahydro-9-thia-1,7-diaza-fluoren-3-yl)-ethanone (the preparation of which is described in example 23) in 5 ml dichloromethane was added 0.02 ml (0.022 mmol) methyl chloroformate and 32 mg (0.022 mmol) potassium carbonate. The mixture was stirred at RT for 1 h and then poured onto water and extracted three times with ethyl acetate. The combined organic phases were dried over sodium sulfate and concentrated in vacuo. Flash chromatography (heptane/ethyl acetate 1:1) afforded 33 mg (56%) 3-Acetyl-2-methyl-4-phenyl-5,8-dihydro-6H-9-thia-1,7-diaza-fluorene-7-carboxylic acid-methyl ester as a light yellow solid. ES-MS m/e (%): 381 (M+H+, 100);

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