Potassium Hydroxide → 4-(5-Morpholin-4-yl-1H-pyrrolo[2,3-c]pyridin-3-yl)-piperidine-1-carboxylic acid tert-butyl ester

Participants

Reaction Conditions

Reaction Steps

A solution of 200 mg (1.0 mmol) of 5-morpholin-4-yl-1H-pyrrolo[2,3-c]pyridine and 398 mg (2.0 mmol, 2 eq) of 4-oxo-piperidine-1-carboxylic acid tert-butyl ester in 5 mL of MeOH was treated with 224 mg (4.0 mmol, 4 eq) of potassium hydroxide. The reaction mixture was stirred at 65° C. for 12 h and volatiles were removed. The crude product was partitioned between CH2Cl2 (100 mL) and 20 mL of H2O. The organic layer was washed with H2O (2×20 mL), dried over Na2SO4 and concentrated. The yellow powder was treated with 630 mg (10 mmol, 10 eq) of ammonium formate and 10% Pd—C (50 mg). The reaction mixture was stirred at 65° C. for 1 h. The reaction mixture was then filtered through a pad of celite and concentrated to obtain a yellow solid. Column chromatography (silica, 5% MeOH/CH2Cl2) provided 180 mg (47% for 2 steps) of a yellow solid. TLC (silica, 5% MeOH/CH2Cl2): Rf=0.40. MS (electrospray): exact mass calculated for C21H30N4O3, 386.23; m/z found, 387.2 [M+H]+.

Provenance & Evidence