Lithium Hydroxide → 2-[5-(4-tert-Butoxycarbonyl-piperazin-1-yl)-pyridin-2-ylamino]-7-cyclopentyl-5-methyl-7H-pyrrolo[2,3-d]pyrimidine-6-carboxylic acid

Participants

Reaction Steps

To a suspension of 2-[5-(4-tert-Butoxycarbonyl-piperazin-1-yl)-pyridin-2-ylamino]-7-cyclopentyl-5-methyl-7H-pyrrolo[2,3-d]pyrimidine-6-carboxylic acid methyl ester (250 mg, 0.467 mmol) (prepared as described in the procedure for the synthesis of Example 384), in MeOH/H2O/DCM (70 mL) is added a solution of lithium hydroxide (39.2 mg, 0.93 mmol) in water (15 mL). The reaction mixture is heated to reflux for 4 hours. The reaction mixture is allowed to cool to room temperature and concentrated in vacuo. The resulting solution is acidified to pH˜3 using saturated aqueous citric acid solution. The solution is evaporated and the residue is purified by preparative HPLC to give 2-[5-(4-tert-Butoxycarbonyl-piperazin-1-yl)-pyridin-2-ylamino]-7-cyclopentyl-5-methyl-7H-pyrrolo[2,3-d]pyrimidine-6-carboxylic acid as a yellow solid (105 mg, 53%). [M+H]+=522.3

Provenance & Evidence