反应详情

To a solution of 5-(4-nitro-phenyl)-3-oxo-pentanoic acid ethyl ester prepared in Example FF (14.2 g, 54 mmol) in dry THF (150 mL) was added NaH (2.43 g of a 60% dispersion in oil, 57.5 mmol), and the mixture was stirred at room temperature for 45 minutes. 4-Nitrobenzyl bromide (13.9 g, 64.3 mmol) was added all at once, and the resulting suspension was stirred overnight at room temperature. Dilute HCl (2N, 100 mL) was added. The solution was extracted with EtOAc; the extracts were combined, washed with brine, and dried (MgSO4). Concentration gave a residue which was chromatographed on silica gel, eluting with 5:1 hexane:EtOAc to 1:1 hexane:EtOAc, to yield the title compound. 1H NMR (CDCl3) δ 1.11 (t, 3 H), 2.66 (m, 1 H), 2.95 (m, 3 H), 3.21 (m, 2 H), 3.75 (t, 1 H), 4.07 (m, 2 H), 7.23 (m, 4 H), 8.05 (d, 4 H).

1. stirringwas stirred overnight at room temperature
2. extractionThe solution was extracted with EtOAc
3. washwashed with brine
4. dry with materialdried (MgSO4)
5. concentrationConcentration
6. customgave a residue which
7. customwas chromatographed on silica gel
8. washeluting with 5:1 hexane