Reaction Steps
In a manner similar to that described in example Z-35, from racemic-(1S,2S)-2-{[(2-methylpropyl)amino]methyl}cyclopentanamine hydrochloride 105 mg, 0.434 mmol) and 16a (56 mg, 0.119 mmol) was prepared racemic-(3aS,5aS,13aS)-N-[(2,4-difluorophenyl)methyl]-5 (2-methylpropyl)-10,12-dioxol-11-[(phenylmethyl)oxy]-2,3,3a,4,5,5a,6,10,12,13a-decahydro-1H-cyclopenta[e]pyrido[1′,2′:4,5]pyrazino[1,2-a]pyrimidine-9-carboxamide (62 mg, 74%). This material was deprotected in a second step similar to the procedure described in example Z-37. Thus, from racemic-(3aS,5aS,13aS)-N-[(2,4-difluorophenyl)methyl]-5-(2-methylpropyl)-10,12-dioxo-11-[(phenylmethyl)oxy]2,3,3a,4,5,5a,6,10,12,13a-decahydro-1H-cyclopenta[e]pyrido[1′,2′:4,5]pyrazino[1,2-a]pyrimidine-9-carboxamide (48 mg, 0.081 mmol) and 10% Pd/C (catalytic amount), the title compound was prepared as a white solid after purification by HPLC (80 mg, 75%). 1H NMR (CDCl3) 12.69 (s, 1H), 10.42 (s, 1H), 828 (s, 1H), 7.34 (m, 1H), 6.79 (m, 2H), 4.83 (s, 1H), 4.68-4.58 (m, 3H), 4.29 (m, 1H), 4.14 (m, 1H), 2.01 (m, 1H), 2.46-2.82 (m, 3H), 2.16-2.09 (m, 2H), 1.85-1.61 (m, 5H), 1.39 (m, 1H), 0.88 (m, 6H); ES+MS: 501 (M+1).
