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0 °C

A solution of compound 12 (51.3 mg, 0.20 mmol) in THF (1 mL) and 0.1 mL 1,3-dimethyl-3,4,5,6-tetrahydro-2(1H)-pyrimidinone (DMPU) was cooled with an ice/water bath and treated dropwise with a suspension of NaH (0.45 mmol) in THF (0.5 mL). The yellow mixture was allowed to stir at 0° C. for 10 min., and was treated dropwise with a 1M solution of iodomethane in THF (0.22 mL, 0.22 mmol). The mixture was allowed to warm to ambient temperature and stirred for 30 min. The reaction was quenched at 0° C. with saturated aqueous NH4Cl, and extracted with EtOAc (5 mL×3). The organic solution was washed with water and brine, dried (Na2SO4), filtered, and concentrated. The crude product was purified by radial chromatography (2 mm SiO2; 1-5% MeOH in CH2Cl2) to yield 18 as a white solid, 44.9 mg (81%). mp 254-256° C. (dec.); 1H NMR (DMSO-d6) δ 2.88 (m, 2H), 3.40 (m, 2H), 3.74 (s, 3H), 7.34 (t, 1H, J=7.7 Hz), 7.56 (m, 5H), 7.73 (d, 1H, J=7.7 Hz), 7.80 (d, 1H, J=7.7 Hz), 8.15 (bt, 1H); Anal. (C18H16N2O.0.75 H2O) C, H, N.

1. temperatureto warm to ambient temperature
2. stirringstirred for 30 min
3. customThe reaction was quenched at 0° C. with saturated aqueous NH4Cl
4. extractionextracted with EtOAc (5 mL×3)
5. washThe organic solution was washed with water and brine
6. dry with materialdried (Na2SO4)
7. filtrationfiltered
8. concentrationconcentrated
9. customThe crude product was purified by radial chromatography (2 mm SiO2; 1-5% MeOH in CH2Cl2)