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

2-Chloro-5-isopropyl-6a,7,9,10-tetrahydro-[1,4]oxazino[3,4-h]pteridin-6(5H)-one (1.20 g, 4.24 mmol) and iodomethane (1.324 mL, 21.22 mmol) were mixed in DMSO. The mixture was frozen, 2-methylpropan-2-olate (1.224 g, 12.73 mmol) was added, covered by a layer of DMSO and refrozen. The mixture was allowed to room temperature and stirred overnight. Another 1 eq of 2-methylpropan-2-olate and iodomethane was added and the mixture stirred overnight at 30° C. The solution was diluted with water and extracted with EtOAc twice. The organic layers were combined, dried over magnesium sulfate, filtered, and evaporated in vacuo. The residue was absorbed onto silica and purified by column chromatography using 10-60% EtOAc in hexanes then 5% methanol in dichloromethane as eluent. Relevant fractions were evaporated in vacuo to give 98 mg (8%) 2-chloro-5-isopropyl-6a-methyl-6a,7,9,10-tetrahydro-[1,4]oxazino[3,4-h]pteridin-6(5H)-one. MS [M+H] Found 297.

1. temperatureThe mixture was frozen
2. customwas allowed to room temperature
3. stirringthe mixture stirred overnight at 30° C
4. extractionextracted with EtOAc twice
5. dry with materialdried over magnesium sulfate
6. filtrationfiltered
7. customevaporated in vacuo
8. customThe residue was absorbed onto silica
9. custompurified by column chromatography
10. customRelevant fractions were evaporated in vacuo

ORD record

ord-960295434ad14bf1accba480663a35fc

Source dataset

uspto-grants-2012_09

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08268819B2