Cyclopentanone → HCID 69811682, compound

Participants

Reaction Steps

Cyclopentanone (17.4 mg, 0.207 mmol) was added to a solution of (R)-tert-butyl 4-(aminomethyl)-5-chloro-1-(5-methyl-6,7-dihydro-5H-cyclopenta[d]pyrimidin-4-yl)spiro[indoline-3,4′-piperidine]-1′-carboxylate (20 mg, 0.041 mmol) in DCE (2 mL). The reaction was allowed to stir at room temperature for 15 minutes, at which point Na(OAc)3BH (22 mg, 0.103 mmol) was added. The reaction was allowed to stir overnight. The reaction mixture was diluted with DCM, washed with saturated aqueous NaHCO3 solution and brine, dried with MgSO4 and concentrated. The residue was purified by column chromatography (15:1, DCM:MeOH) to give (R)-tert-butyl 5-chloro-4-((cyclopentylamino)methyl)-1-(5-methyl-6,7-dihydro-5H-cyclopenta[d]pyrimidin-4-yl)spiro[indoline-3,4′-piperidine]-1′-carboxylate (13 mg, 54%) as an oil. LCMS (APCI+) m/z 552/554 [M+H]+; Rt=4.79 min. This material was taken up into DCM (2 mL), and 2N HCl in ether was added (1 mL). The reaction was allowed to stir for 1 hour, at which point it was concentrated to give (R)—N-((5-chloro-1-(5-methyl-6,7-dihydro-5H-cyclopenta[d]pyrimidin-4-yl)spiro[indoline-3,4′-piperidine]-4-yl)methyl)propan-2-amine trihydrochloride salt (12 mg, 52%) as a solid. 1H NMR (D2O, 400 MHz) δ 8.53 (s, 1H), 7.74 (d, J=8.8 Hz, 1H), 7.40 (d, J=8.8 Hz, 1H), 4.55-4.39 (m, 3H), 4.17-4.15 (m, 1H), 3.84-3.38 (m, 7H), 3.17-2.97 (m, 4H), 2.44-1.67 (m, 14H). LCMS (APCI+) m/z 452/454 [M+H]+; Rt=2.52 min.

Provenance & Evidence