Triethylamine → methyl5,6-dihydro-5-oxo-11-H-indeno[1,2-c]isoquinoline-10-carboxylate

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Reaktionsschritte

A mixture of methyl 2-bromomethyl-3-cyanobenzoate (14.1 g, 55.5 mmol) and homophtalic anhydride (22.5 g, 138.8 mmol) in acetonitrile (150 mL) was stirred at room temperature. A solution of triethylamine (23.2 mL) in acetonitrile (100 mL) was added dropwise over the period of 1 hour. After the completion of addition, the resultant suspension was refluxed for 4 hours. The reaction mixture was then cooled to room temperature and filtered. The resultant solid was washed thoroughly with acetonitrile (100 mL) and ethanol (2×100 mL) and dried in vacuum oven at 50° C. to provide methyl 5,6-dihydro-5-oxo-11-H-indeno[1,2-c]isoquinoline-10-carboxylate was obtained in 81% yield (13.1 g). 1H NMR spectrum (in DMSO-d6): δ 12.21 (s, 1H); 8.20 (m, 2H); 7.83 (d, J=7.5 Hz, 1H); 7.71 (m, 2H); 7.47 (m, 2H); 4.07 (s, 2H); 3.89 (s, 3H).

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