Methanol → 6-(4-Acetyl-phenyl)-5-(4-chloro-phenyl)-1-phenyl-1,5-dihydro-pyrazolo[3,4-d]pyrimidin-4-one

A solution of 4-[5-(4-chloro-phenyl)-4-oxo-1-phenyl-4,5-dihydro-1H-pyrazolo[3,4-d]pyrimidin-6-yl]-benzoic acid methyl ester (450 mg, 0.98 mmol) in dioxane (6 mL) is added NaOH (2 N, 1.5 mL, 3 mmol) and stirred at room temperature for 14 h. The mixture is then concentrated and treated with SOCl2 (4 mL) at room temperature for 1 h. The excess SOCl2 is removed under vacuum and flushed with toluene (2×2 mL). The resulted residue is dissolved in CH2Cl2 (3 mL) and slowly dropped into a solution of freshly prepared Me2CuLi (2.0 mmol) in Et20 (4 mL) at −78° C. The mixture is kept at the same temperature for 1 h. when MeOH (1 mL) is added to quench the reaction. The mixture is then allowed to warm up to room temperature and treated with saturated aqueous NH4Cl solution (20 mL). After extraction with EtOAc(3×15 mL), the organic layers are combined, washed with brine and dried (MgSO4). After filtering off the drying agent, the solvent is removed under vacuum and the residue is purified by flash column chromatography (silica gel, 0%˜50% EtOAc/hexane) to provide the titled compound 6-(4-acetyl-phenyl)-5-(4-chloro-phenyl)-1-phenyl-1,5-dihydro-pyrazolo[3,4-d]pyrimidin-4-one. HPLC-MS calculated for C25H17ClN4O2 (M+H+): 441.1. Found: 441.1.

1. concentrationThe mixture is then concentrated
2. additiontreated with SOCl2 (4 mL) at room temperature for 1 h
3. customThe excess SOCl2 is removed under vacuum
4. customflushed with toluene (2×2 mL)
5. dissolutionThe resulted residue is dissolved in CH2Cl2 (3 mL)
6. additionslowly dropped into a solution
7. customof freshly prepared Me2CuLi (2.0 mmol) in Et20 (4 mL) at −78° C
8. waitThe mixture is kept at the same temperature for 1 h.
9. customto quench
10. customthe reaction
11. temperatureto warm up to room temperature
12. extractionAfter extraction with EtOAc(3×15 mL)
13. washwashed with brine
14. dry with materialdried (MgSO4)
15. filtrationAfter filtering off the drying agent
16. customthe solvent is removed under vacuum
17. customthe residue is purified by flash column chromatography (silica gel, 0%˜50% EtOAc/hexane)

ORD-Eintrag

ord-11dfb4e4052540bea4fd2ec17d8ce17e

Quelldatensatz

uspto-grants-2012_04

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US08158634B2