phenylalaninol, (R)- → HCID 15667126, compound

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Reaction Steps

First, 2.81 g of 1-phenyl-4,6-dichloropyrazolo[3,4-d]pyrimidine was suspended in 60 ml of ethanol, then 3.2 g of (R)-(+)-2-amino-3-phenyl-1-propanol was added with stirring. After 48 hours the solvent was removed under vacuum and the oil was flash chromatographed (2-5-7% MeOH/CHCl3) to yield 3.80 g of (R)-β-[(1-phenyl-6-chloro-1H-pyrazolo[3,4-d]pyrimidin-4-yl)amino]benzenepropanol (95%). Next, 380 mg of sodium was reacted with 10 ml of n-propanol. 773 mg of (R)-β-[(1-phenyl-6-chloro-1H-pyrazolo[3,4-d]pyrimidin-4-yl)amino]benzenepropanol in 5 ml of n-propanol was added with stirring. The reaction was heated to 90° C. in an oil bath for 2.5 hours, then the solvent was removed under vacuum, the residue taken up in 200 ml CHCl3. The organic layer was washed with saturated NaCl, dried over MgSO4, filtered, and concentrated to an oil which was purified by radial chromatography (10-20-30% isopropyl alcohol/hexane, 4 mm plate) to yield after recrystallization from 30% isopropyl alcohol/hexane 217 mg of a white solid (m.p. 158°-159° C.). Proton NMR indicated n-propanol was still present, so this product was oven dried under vacuum (setting at 3) to yield 161 mg of final product, (R)-β-[(1-phenyl-6-propoxy-1H-pyrazolo[3,4-d]pyrimidin-4-yl)-amino]benzenepropanol (m.p. 157°-158° C.).

Provenance & Evidence