4-Iodophenylhydrazine hydrochloride → 8-Iodo-5,10-dihydro-indeno[1,2-b]indole-1-carboxylic acid

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Reaction Steps

1-Oxo-indan-4-carboxylic acid (0.528 g, 2.99 mmol) and 4-iodophenylhydrazine hydrochloride (0.698 g, 2.58 mmol) were mixed together in a Teflon PFA vessel to form a paste in formic acid (2 mL, 96%) containing 3 drops of concentrated HCl. The vessel was irradiated at full power (760W) in a CEM Microwave (MDS2000) for one minute (T=140C, P<50 PSI), allowed to cool for 2 min, then irradiated again for one min (T=140C, P<50 PSI). The mixture was vacuum filtered hot. The solid was washed with formic acid, and dried on the frit. Chromatography (acetone/hexane) and trituration with diethyl ether have the title compound (0.059 g, 5%) as an tan solid: mp 251° C.; 1H NMR (DMSO-d6): δ 3.98 (s, 2H), 7.30-7.37 (m, 2H), 7.49 (t, 1H), 7.77-7.80 (m, 2H), 7.98 (d, 1H), 11.82 (s, 1H), 13.53 (s, 1H); MS [EI, m/z]: 375 [M]+.

Provenance & Evidence