反应详情

To a solution of 2-cyclopropyl-5-(2-trimethylsilanyl-ethoxymethyl)-5H-pyrrolo[2,3-b]pyrazine-7-carboxylic acid (2-carbamoyl-1-cyclopropyl-2-methyl-propyl)-amide (108 mg, 0.23 mmol) in CH2Cl2 (4 mL) was added TFA (1 mL). The yellow reaction mixture was stirred for 3 h then concentrated The residue was redissolved in CH2Cl2 (4 ml) and ethylenediamine (0.5 mL) was added. The reaction mixture was stirred for 1 h then concentrated. The residue was purified by SiO2 chromatography (50% to 100% EtOAc/hexanes to 5% MeOH/EtOAc) followed by trituration with Et2O to afford 44 mg (56%) of 2-cyclopropyl-5H-pyrrolo[2,3-b]pyrazine-7-carboxylic acid (2-carbamoyl-1-cyclopropyl-2-methyl-propyl)-amide as a white solid. MS: (M+H)+=342; mp=222.0-224.0.

1. concentrationthen concentrated The residue
2. dissolutionwas redissolved in CH2Cl2 (4 ml)
3. additionethylenediamine (0.5 mL) was added
4. stirringThe reaction mixture was stirred for 1 h
5. concentrationthen concentrated
6. customThe residue was purified by SiO2 chromatography (50% to 100% EtOAc/hexanes to 5% MeOH/EtOAc)