1-Ethyl-3-(3'-dimethylaminopropyl)carbodiimide → 3,4-Dichlorobenzoic acid N'-(5-chloro-1H-pyrrolo[3,2-b]pyridine-2-carbonyl)hydrazide

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Reaction Steps

To a solution of 5-chloro-1H-pyrrolo[3,2-b]pyridine-2-carboxylic acid (Preparation 5, 20.0 mg, 0.10 mmol) in DMF (5 mL) was added 3,4-dichlorobenzoic acid hydrazide (23 mg, 0.11 mmol), DIPEA (19.5 μL, 0.11 mmol) and HOBt (14.0 mg, 0.10 mmol). The resulting solution was stirred for 5 min prior to the addition of EDCI (23 mg, 1.20 mmol). The reaction mixture was stirred for 16 hr at rt then partitioned between water (10 mL) and dichloromethane (20 mL) on a hydrophobic frit. The aqueous phase was extracted with a further portion of dichloromethane (30 mL) and the combined organics were concentrated in vacuo. Trituration of the resulting residue with ethyl acetate/dichloromethane gave the title compound. δH (d6 DMSO): 12.25 (1H, s), 10.83 (2H, d), 8.17 (1H, s), 7.55-7.97 (3H, m), 7.38 (1H, s), 7.26 (1H, d); m/z (ES+)=383 [M+H]+; RT=3.37 min.

Provenance & Evidence