Sodium Carbonate → N-(1-aminopiperidin-4-yl)-3,4-dichloro-5-methyl-1H-pyrrole-2-carboxamide

Participants

Reaction Conditions

Reaction Steps

A 20% solution of TiCl3 (36 ml, 27 mmol) in water was added to a solution of 3,4-dichloro-5-methyl-N-(1-nitrosopiperidin-4-yl)-1H-pyrrole-2-carboxamide (Intermediate 87, 2.8 g, 9.2 mmol) in 60 ml of MeOH. The mixture was heated to 70° C. for 1 hour. Aqueous Na2CO3 was added to basify the mixture, which was filtered through Celite rinsing through with MeOH until no more material eluted. The filtrate was concentrated and the residual aqueous solution was saturated with NaCl before being extracted 6 times with DCM. The combined organic layers were dried (MgSO4) and solvent was removed to give product as a beige solid.

Provenance & Evidence