Reaction Steps
Pd/C (35.2 mg, 0.017 mmol) and ammonium formate (52.2 mg, 0.827 mmol) was added to a solution of (5R,7R)-4-((S)-1′-benzyl-4-((isopropylamino)methyl)spiro[indoline-3,3′-pyrrolidine]-1-yl)-5-methyl-6,7-dihydro-5H-cyclopenta[d]pyrimidin-7-ol (40.0 mg, 0.083 mmol) in MeOH (3 mL). The resulting mixture was stirred at ambient temperature overnight. The reaction mixture was filtered, and the filtrate was concentrated and purified by Analogix chromatography (DCM/MeOH/1% NH4OH gradient) to give (5R,7R)-4-((S)-4-((isopropylamino)methyl)spiro[indoline-3,3′-pyrrolidine]-1-yl)-5-methyl-6,7-dihydro-5H-cyclopenta[d]pyrimidin-7-ol. This material was converted to the bis-HCl salt by dissolving the material in DCM and adding HCl (4N in dioxane) and concentrating the mixture (9.0 mg, 0.022 mmol, 27%). 1H NMR (400 MHz, d6-DMSO) δ 10.05 (br s, 1H), 9.92 (br s, 1H), 9.58 (br s, 1H), 9.47 (br s, 1H), 8.89 (s, 1H), 8.10 (d, J=8.2 Hz, 1H), 7.66 (s, J=7.8 Hz, 1H), 7.46 (t, J=8.2 Hz, 1H), 5.30 (t, J=7.8 Hz, 1H), 4.83 (d, J=10.5 Hz, 1H), 4.35 (t, J=10.5 Hz, 1H), 4.20 (d, J=7.8 Hz, 1H), 4.14 (d, J=10.9 Hz, 1H), 3.96-3.85 (m, 1H), 3.71-3.67 (m, 4H), 3.43 (dd, J=10.9, 3.9 Hz, 2H), 3.41-3.31 (m, 2H), 2.63-2.58 (m, 1H), 2.35-2.33 (m, 1H), 2.18-2.13 (m, 2H), 1.41 (d, J=6.2 Hz, 6H), 1.18 (d, J=6.4 Hz, 2H), 1.12 (d, J=6.6 Hz, 3H). LCMS (APCI+) M+H+ 394 (100%); Rt=1.72 min. HPLC purity at 254 nm >99%, Rt=1.63 min.
