m-Chloroperbenzoic acid → 4-chloro-6,7-dihydro-5H-cyclopenta[d]pyrimidine 1-oxide

To a solution of 4-chloro-6,7-dihydro-5H-cyclopenta[d]pyrimidine (5.69 g, 36.8 mmol) in chloroform (200 mL) was added MCPBA (19 g, 84.8 mmol) in chloroform (50 mL) dropwise. The mixture was stirred at room temperature for 16 hour. After cooling with ice-water, the mixture was quenched with Na2S2O3 (27.5 g) in water (110 mL) dropwise and followed by Na2CO3 (14 g) in water (52 mL) dropwise. The organic phase was separated and the aqueous phase was extracted with chloroform (3×200 mL). The organic phase was dried and concentrated at low temperature (<25° C.). The residue was subject to chromatography on silica gel, eluting by ethyl acetate to afford 4-chloro-6,7-dihydro-5H-cyclopenta[d]pyrimidine 1-oxide (2.93 g, 47%). MS (APCI+) [M+H]+171.

1. customthe mixture was quenched with Na2S2O3 (27.5 g) in water (110 mL) dropwise
2. customThe organic phase was separated
3. extractionthe aqueous phase was extracted with chloroform (3×200 mL)
4. customThe organic phase was dried
5. concentrationconcentrated at low temperature (<25° C.)
6. washeluting by ethyl acetate

ORD record

ord-85070ce1a0ac43d0b4d62fccd818884d

Source dataset

uspto-grants-2011_11

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08063050B2