反应详情

(4S)—N-(4-Methoxybenzyl)-4,6,7-trimethyl-3,4-dihydro-1H-pyrido[3′,4′:4,5]imidazo[2,1-c][1,4]oxazin-9-amine (350 mg, 0.99 mmol) was dissolved in 15 mL of trifluoroacetic acid and stirred at ambient temperature overnight. The solvent was removed under reduced pressure to give an orange residue which was then treated with 30 mL of aqueous 10% NaOH solution and the mixture was stirred for 2 hours. The solution was then extracted with CH2Cl2 (3×30 mL). The combined organic layers were washed with brine, dried over Na2SO4, filtered and concentrated under reduced pressure to give an orange solid. Chromatography (SiO2, 10-30% CMA/CHCl3) gave an off-white solid. Crystallization from acetonitrile gave (4S)-4,6,7-trimethyl-3,4-dihydro-1H-pyrido[3′,4′:4,5]imidazo[2,1-c][1,4]oxazin-9-amine (115 mg) as a white powder, mp 264-267° C.

1. customThe solvent was removed under reduced pressure
2. customto give an orange residue which
3. stirringthe mixture was stirred for 2 hours
4. extractionThe solution was then extracted with CH2Cl2 (3×30 mL)
5. washThe combined organic layers were washed with brine
6. dry with materialdried over Na2SO4
7. filtrationfiltered
8. concentrationconcentrated under reduced pressure
9. customto give an orange solid
10. customCrystallization from acetonitrile