Hydrochloric Acid → 3-Bromo-9H-dipyrido[2,3-b;4',3'-d]pyrrole-6-carboxylic acid azide

Participants

Reaction Conditions

Reaction Steps

Hydrogen chloride (3.0 mL, 90 mmol) was added dropwise to a suspension of 3-bromo-9H-dipyrido[2,3-b;4′,3′-d]pyrrole-6-carboxylic acid hydrazide (530 mg, 1.73 mmol) in water (12.4 mL). Once homogeneous, the solution was cooled to 0° C. and a solution of 3N sodium nitrite in water (0.60 mL, 2.0 mmol) was added to the mixture. After 1 h, added another 1.03 eq. of 3N sodium nitrite in water (0.60 mL, 2.0 mmol) and allowed the reaction to warm to ambient temperature over night. After 17 h at room temperature, the reaction was cooled to 0° C. and a solution of 3N sodium nitrite in water (0.60 mL, 2.0 mmol) was added and then warmed to room temperature. The reaction was made basic with a solution of saturated sodium bicarbonate, and the solid precipitate was collected by filtration, washed with water, and dried in a dessicator under vacuum to provide a solid material that was 70% pure by LCMS analysis.

Provenance & Evidence