Compositions for treating spinal muscular atrophy
a technology of spinal muscular atrophy and compositions, applied in the direction of muscular disorder, drug compositions, dispersed delivery, etc., can solve the problems of muscle weakness, poor muscle tone, weak cry,
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example 1
2-(2-methylimidazo[1,2-b]pyridazin-6-yl)-7-(4-methylpiperazin-1-yl)pyrido[1,2-a]pyrimidin-4-one
[0550]
[0551]In a sealed tube, 7-fluoro-2-(2-methylimidazo[1,2-b]pyridazin-6-yl)-4H-pyrido[1,2-a]pyrimidin-4-one (Intermediate 1; 35 mg, 0.119 mmol) and 1-methylpiperazine (47.5 mg, 0.474 mmol, 4 eq.) were stirred in DMSO (1 mL) at 120° C. overnight. LC-MS showed total convertion. The solvent was removed under high vacuum. The crude product was purified by column chromatography (SiO2, CH2Cl2 / MeOH=95 / 5 to 9 / 1) to afford the title product (25 mg, 56%) as a light yellow solid. MS m / z 376.3 [M+H+].
example 2
7-[(8aR)-3,4,6,7,8,8a-hexahydro-1H-pyrrolo[1,2-a]pyrazin-2-yl]-2-(2-methylimidazo[1,2-b]pyridazin-6-yl)pyrido[1,2-a]pyrimidin-4-one
[0552]
[0553]In a sealed tube, 7-fluoro-2-(2-methylimidazo[1,2-b]pyridazin-6-yl)-4H-pyrido[1,2-a]pyrimidin-4-one (Intermediate 1; 125 mg, 0.426 mmol) and (R)-octahydropyrrolo-[1,2-a]pyrazine (160 mg, 1.27 mmol, 3 eq.) were stirred in DMSO (5 mL) at 125° C. overnight. The solvent was removed under high vacuum. The residue was taken up in CH2Cl2 and washed with an aqueous saturated solution of NaHCO3. The organic layer was separated and dried over Na2SO4 and concentrated in vacuo. The crude was purified by column chromatography (SiO2, CH2Cl2 / MeOH=98 / 2 to 95 / 5) to afford the title product (65 mg, 38%) as a light yellow solid. MS m / z 402.5 [M+H+].
example 3
7-[(8aS)-3,4,6,7,8,8a-hexahydro-1H-pyrrolo[1,2-a]pyrazin-2-yl]-2-(2,8-dimethylimidazo[1,2-b]pyridazin-6-yl)pyrido[1,2-a]pyrimidin-4-one
[0554]
[0555]In a sealed tube, 2-(2,8-dimethylimidazo[1,2-b]pyridazin-6-yl)-7-fluoro-pyrido[1,2-a]pyrimidin-4-one (Intermediate 2; 200 mg, 0.647 mmol) and (S)-octahydropyrrolo-[1,2-a]pyrazine (286 mg, 2.26 mmol, 3.5 eq.) were stirred in DMSO (5 mL) at 125° C. overnight. The solvent was removed under high vacuum. The residue was taken up in CH2Cl2 and washed with an aqueous saturated solution of NaHCO3. The organic layer was separated and dried over Na2SO4 and concentrated in vacuo. The crude was purified by column chromatography (SiO2, CH2Cl2 / MeOH=98 / 2 to 95 / 5) to afford the title product (115 mg, 43%) as a light yellow solid. MS m / z 416.3 [M+H+].
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