Barbituric Acid → (2R,4S,4aS)-rel-11-fluoro-2,4,8-trimethyl-1,2,4,4a-tetrahydro-2'H,6H-spiro[isoxazolo[4,5-g][1,4]oxazino[4,3-a]quinoline-5,5'-pyrimidine]-2',4',6'(1'H,3'H)-trione

Temperature

80 °C

To a stirred solution of 6-((2R,6S)-2,6-dimethylmorpholino)-7-fluoro-3-methylbenzo[d]isoxazole-5-carbaldehyde (Intermediate 34, 543 mg, 1.86 mmol) in isopropanol (50 ml) was added pyrimidine-2,4,6(1H,3H,5H)-trione (238 mg, 1.86 mmol), and the reaction mixture was stirred for 16 hours at 80° C. Solvent was removed and the residue was triturated with isopropanol. The solid was filtered, washed with isopropanol, and dried in vacuo. The filtrate was concentrated and purified on silica gel (30-50% EtOAc in hexanes). The product thus obtained was combined with the filtered solid in methanol and concentrated to give the title compound (528 mg, 71%) as a racemic mixture.

1. customSolvent was removed
2. customthe residue was triturated with isopropanol
3. filtrationThe solid was filtered
4. washwashed with isopropanol
5. customdried in vacuo
6. concentrationThe filtrate was concentrated
7. custompurified on silica gel (30-50% EtOAc in hexanes)
8. customThe product thus obtained
9. concentrationconcentrated

ORD record

ord-76579a391f164837a42e15b302a5a9a1

Source dataset

uspto-grants-2015_05

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US09040528B2