[Cl:1][C:2]1[N:10]=[C:9]2[C:5]([N:6]=[CH:7][N:8]2[CH2:11][CH2:12][C:13](OCC)=[O:14])=[C:4]([N:18]2[CH2:23][CH2:22][O:21][CH2:20][CH2:19]2)[N:3]=1.[CH2:24]([Mg]Br)[CH3:25]>C(OCC)C.[O-]CC.[Ti+4].[O-]CC.[O-]CC.[O-]CC>[Cl:1][C:2]1[N:10]=[C:9]2[C:5]([N:6]=[CH:7][N:8]2[CH2:11][CH2:12][C:13]2([OH:14])[CH2:25][CH2:24]2)=[C:4]([N:18]2[CH2:19][CH2:20][O:21][CH2:22][CH2:23]2)[N:3]=1A solution of ethyl 3-(2-chloro-6-morpholino-9H-purin-9-yl)propanoate (500 mg, 1.5 mmol) in diethylether (37 mL) was treated with titanium (IV) ethoxide (31 uL, 0.15 mmol) followed by the dropwise addition of 3.0M ethylmagnesium bromide in ether (0.98 mL, 2.9 mmol) at ambient temperature for 90 minutes. Partial conversion prompted the addition of titanium (IV) ethoxide (31 uL, 0.15 mmol) and 3.0M ethylmagnesium bromide in ether (0.98 mL, 2.9 mmol). After 2 hr, the reaction mixture was quenched with an aqueous 1.0M solution of HCl (20 mL) and filtered through a plug of celite, washing with ethyl acetate. The mixture was diluted with water and ethyl acetate and the layers separated. The aqueous phase was extracted into EtOAc (3×), dried over sodium sulfate, filtered, and absorbed onto celite for purification by flash chromatography to afford 1-(2-(2-chloro-6-morpholino-9H-purin-9-yl)ethyl)cyclopropanol as a colorless oil (220 mg, 46%). LC/MS (ESI+): m/z 324 (M+H)
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