Imidazole → (1S,2S,4R)-2-({[tert-Butyl(dimethyl)silyl]oxy}methyl)-4-{4-[(1S)-2,3-dihydro-1H-inden-1-ylamino]-7H-pyrrolo[2,3-d]pyrimidin-7-yl)cyclopentyl acetate

(1S,2S,4R)-4-{4-[(1S)-2,3-Dihydro-1H-inden-1-ylamino]-7H-pyrrolo[2,3-d]-pyrimidin-7-yl}-2-(hydroxymethyl)cyclopentanol (3.00 g, 8.23 mmol), 1H-imidazole (1.68 g, 24.7 mmol) and 4-(dimethylamino)-pyridine (100 mg, 0.818 mmol) were dissolved in DMF (90.0 mL) under an atmosphere of argon and the solution was cooled to 0° C. tert-Butyldimethylsilyl chloride (1.24 g, 8.23 mmol) was added and the mixture was stirred at rt for 2 h. LC/MS indicated complete conversion. The reaction was quenched with saturated aqueous sodium chloride solution (30 mL), extracted with EtOAc (3×50 mL), dried with MgSO4, filtered, and concentrated in vacuo. The remaining DMF was removed under high vacuum. Crude (1S,2S,4R)-2-({[tert-butyl(dimethyl)silyl]oxy}methyl)-4-{4-[(1S)-2,3-dihydro-1H-inden-1-ylamino]-7H-pyrrolo[2,3-d]pyrimidin-7-yl}cyclopentanol (3.94 g, 8.23 mmol) and 4-(dimethylamino)-pyridine (100. mg, 0.818 mol) were dissolved in pyridine (70.0 mL) and acetic anhydride (4.66 mL, 49.4 mmol) was added. The mixture was stirred at rt overnight. The solvent was evaporated and the remaining pyridine was removed under high vacuum. The residue was purified via silica gel chromatography eluting with a gradient of 10 to 66% EtOAc in hexanes to afford the title compound (3.66 g, 86%). LC/MS: Rt=2.51 min, ES+ 521 (AA standard).

1. additionwas added
2. customThe reaction was quenched with saturated aqueous sodium chloride solution (30 mL)
3. extractionextracted with EtOAc (3×50 mL)
4. dry with materialdried with MgSO4
5. filtrationfiltered
6. concentrationconcentrated in vacuo
7. customThe remaining DMF was removed under high vacuum
8. stirringThe mixture was stirred at rt overnight
9. customThe solvent was evaporated
10. customthe remaining pyridine was removed under high vacuum
11. customThe residue was purified via silica gel chromatography
12. washeluting with a gradient of 10 to 66% EtOAc in hexanes

ORD record

ord-830928b8bd8b48da8c6da0a13bcf474f

Source dataset

uspto-grants-2012_06

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08207177B2