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To a mixture of 2-chloro-6a,7,9,10-tetrahydro-[1,4]oxazino[3,4-h]pteridin-6(5H)-one (100 mg, 0.416 mmol), K2CO3 (115 mg, 0.831 mmol) in DMF (2 mL) at 0° C., was added 3-(chloromethyl)-1-methyl-1H-pyrazole (54.3 mg, 0.416 mmol). The mixture was stirred at 0° C. for 30 minutes and then at room temperature for overnight. Water was added and the mixture was extracted with EtOAc (2×). The aqueous layer was basified and then extracted with EtOAc. The combined organic layers were dried over MgSO4, filtered and evaporated in vacuo to give 2-chloro-5-((1-methyl-1H-pyrazol-3-yl)methyl)-6a,7,9,10-tetrahydro-[1,4]oxazino[3,4-h]pteridin-6(5H)-one (104 mg) which was used in the next step without further purification. MS [M+H] Found 335.

1. waitat room temperature for overnight
2. extractionthe mixture was extracted with EtOAc (2×)
3. extractionextracted with EtOAc
4. dry with materialThe combined organic layers were dried over MgSO4
5. filtrationfiltered
6. customevaporated in vacuo