Water → 2-chloro-5-(2,2,2-trifluoroethyl)-6a,7,9,10-tetrahydro-[1,4]oxazino[3,4-h]pteridin-6(5H)-one

Temperature

0 °C

To a solution of 2-chloro-6a,7,9,10-tetrahydro-[1,4]oxazino[3,4-h]pteridin-6(5H)-one (363 mg, 1.509 mmol) in DMF (6 ml) at 0° C. was added NaH (72.4 mg, 1.81 mmol). After 15 minutes of stirring at 0° C., a solution of 2,2,2-trifluoroethyl trifluoromethanesulfonate (525 mg, 2.26 mmol) in DMF (1 ml) was slowly added. The reaction mixture was stirred at room temperature for 1.5 hours. The reaction mixture was poured into water and extracted with EtOAc. The organic layers were washed with water, dried over Na2SO4 and concentrated in vacuo to give a crude oil. The crude residue was purified by silica gel chromatography (hexane/ethyl acetate, 19:1 to 1:1) to afford 2-chloro-5-(2,2,2-trifluoroethyl)-6a,7,9,10-tetrahydro-[1,4]oxazino[3,4-h]pteridin-6(5H)-one (373 mg, 1.16 mmol, 77% yield) as a yellow solid. MS [M+H] found 323.

1. stirringThe reaction mixture was stirred at room temperature for 1.5 hours
2. extractionextracted with EtOAc
3. washThe organic layers were washed with water
4. dry with materialdried over Na2SO4
5. concentrationconcentrated in vacuo
6. customto give a crude oil
7. customThe crude residue was purified by silica gel chromatography (hexane/ethyl acetate, 19:1 to 1:1)

ORD record

ord-8d5a09c90c5548e08396ad96f3b2b53a

Source dataset

uspto-grants-2012_09

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08268819B2