反应详情

Compound A8 (0.67 g, 1.59 mmol) was dissolved in DCM (3 mL) and combined with trifluoroacetic acid (3 mL). The reaction mixture was stirred for 5 min at RT and the solvent was then removed under a vacuum. The residue was combined repeatedly with toluene and the solvent was then removed again. The residue was then combined with sat. aq. NaHCO3 solution and repeatedly extracted with EtOAc. The combined organic phases were dried over Na2SO4 and the solvent was removed under a vacuum. The residue was redissolved in anhydrous THF (5 mL) and combined with diisopropylethylamine (333 μL, 1.91 mmol). The reaction mixture was combined with 3-phenoxypropyl bromide (277 μL, 1.75 mmol), stirred for 18 h at RT and combined with water and EtOAc. The organic phase was separated off and the aqueous phase repeatedly extracted with EtOAc. The combined organic phases were dried over Na2SO4 and the solvent was removed under a vacuum. The residue was purified by column chromatography (SiO2, DCM/MeOH 98:2). 433 mg (58% of theoretical) of the desired product 3-(2-methoxy-5-nitrobenzyl)-8-(3-phenoxypropyl)-1-oxa-3,8-diazaspiro[4.5]decan-2-one (432) were obtained.

1. customthe solvent was then removed under a vacuum
2. customthe solvent was then removed again
3. extractionrepeatedly extracted with EtOAc
4. dry with materialThe combined organic phases were dried over Na2SO4
5. customthe solvent was removed under a vacuum
6. dissolutionThe residue was redissolved in anhydrous THF (5 mL)
7. stirringstirred for 18 h at RT
8. customThe organic phase was separated off
9. extractionthe aqueous phase repeatedly extracted with EtOAc
10. dry with materialThe combined organic phases were dried over Na2SO4
11. customthe solvent was removed under a vacuum
12. customThe residue was purified by column chromatography (SiO2, DCM/MeOH 98:2)