Malononitrile → 2-Amino-4-(3-bromo-4,5-dimethoxyphenyl)-3-cyano-7-hydroxymethyl-4H-pyrrolo[2,3-h]chromene

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Reaction Steps

2-Amino-4-(3-bromo-4,5-dimethoxyphenyl)-3-cyano-7-hydroxy-methyl-4H-pyrrolo[2,3-h]chromene: The title compound was prepared from 1-hydroxymethyl-4-hydroxy-indole (550 mg, 3.37 mmol), 5-bromoveratraldehyde (826 mg, 3.37 mmol), malononitrile (222 mg, 3.37 mmol) and piperidine (0.17 mL, 1.7 mmol), similar to Example 16, to yield 1.15 g (75%) of a white solid. 1H NMR (CDCl3): 7.22-7.18 (m, 2H), 6.90 (d, J=1.8 Hz, 1H), 6.81 (d, J=8.4 Hz, 1H), 6.75 (d, J=1.8 Hz, 1H), 6.64 (d, J=3.3 Hz, 1H), 5.61 (s, 21), 4.77 (s, 1M, 4.70 (brs, 2H), 3.83 (s, 31), 3.82 (s, 3H), 2.47 (brs, 1H).

Provenance & Evidence