Trifluoroacetic acid → 8-(2-chlorophenyl)-9-(4-chlorophenyl)-N-[(3R)-piperidin-3-yl]-9H-purin-6-amine

Participants

Reaction Steps

A solution of tert-butyl (3R)-3-{[8-(2-chlorophenyl)-9-(4-chlorophenyl)-9H-purin-6-yl]amino}piperidine-1-carboxylate (109 mg, 0.202 mmol) was stirred in dichloromethane (7 mL) and trifluoroacetic acid (3 mL) for 16 h. The reaction was concentrated in vacuo. The crude product was dissolved in ethyl acetate and washed with saturated NaHCO3. The aqueous layer was extracted twice with ethyl acetate. The combined organic layer was washed with brine and dried with MgSO4. The crude material was purified by silica gel column chromatography using 0-100% CMA 80/ethyl acetate to yield 70 mg (79%) of 8-(2-chlorophenyl)-9-(4-chlorophenyl)-N-[(3R)-piperidin-3-yl]-9H-purin-6-amine. 1H NMR (300 MHz, CHLOROFORM-d) δ ppm 1.43-1.82 (m, 4 H) 1.91-2.03 (m, 1 H) 2.67 (dt, J=11.68, 7.16 Hz, 2 H) 2.76-2.94 (m, 1 H) 3.21 (dd, J=11.82, 2.87 Hz, 1 H) 4.28 (br. s., 1 H) 6.11 (d, J=6.12 Hz, 1 H) 6.98-7.57 (m, 8 H) 8.36 (s, 1 H), [M+H]+ 439.6.

Provenance & Evidence