[H-].[Na+].[C:3]([O:11][CH2:12][CH3:13])(=[O:10])[CH2:4][C:5]([O:7]CC)=O.[CH2:14]([N:18]1[C:23]2[N:24]=[CH:25][CH:26]=[CH:27][C:22]=2C(=O)[O:20][C:19]1=O)[CH2:15][CH2:16][CH3:17]>CC(N(C)C)=O>[CH2:14]([N:18]1[C:23]2[C:22](=[CH:27][CH:26]=[CH:25][N:24]=2)[C:5]([OH:7])=[C:4]([C:3]([O:11][CH2:12][CH3:13])=[O:10])[C:19]1=[O:20])[CH2:15][CH2:16][CH3:17]To a slurry of NaH (95%, 0.44 g, 18.2 mmol) in 15 mL anhydrous DMA at 10° C. under N2 was added diethyl malonate (2.9 g, 18.2 mmol) dropwise over 10 minutes. The mixture was stirred at ambient temperature for 30 minutes, treated with the product of Example 1B (2.0 g, 9.1 mmol) and heated at 120° C. for 3 hours. The mixture was cooled to ambient temperature and partitioned between ethyl acetate and cold water adjusting the pH to with 1 M HCl. The organic layer was washed 2×100 mL with water, 2×100 mL with saturated brine, dried (Na2SO4), filtered and the filtrate was concentrated under vacuum. The residue was recrystallized from hexane/ethyl acetate to give the desired compound as a white solid (1.84 g, 70% yield). MS (APCI+) m/z 291 (M+H)+.
Wird geladen…
