反应详情

A solution of 21.9 mL (156 mmol) of diisopropylamine in dry THF (100 mL) was cooled to -40° C. under nitrogen, treated dropwise with 125 mL of 1.2M n-BuLi (150 mmol), and stirred for 30 minutes. To this solution was added a solution of 22.5 g (150 mmol) of benzyl acetate in dry THF (70 mL). The mixture was stirred at -40° C. for 45 minutes and then treated with a solution of 16.2 g (50 mmol) of [4-(4-methyl-3-oxo-pentyl)-phenyl]-carbamic acid benzyl ester (prepared in Example HHHHH) at a rapid, dropwise rate. When addition was complete, the reaction mixture was stirred at -40° C. for 30 minutes. Acetic acid (50 mL) was added, and the mixture was warmed to room temperature. EtOAc and H2O were added. The organic layer was separated, washed with brine, and dried (MgSO4). Concentration gave a residue which was chromatographed on silica gel, eluting with EtOAc:hexane (40:60), to give the title compound. 1H NMR (CDCl3) δ 0.88-0.91 (t, 6 H), 1.65-1.75 (m, 2 H), 1.85-1.89 (m, 1 H), 2.46-2.61 (m, 4 H), 3.52 (s, 1 H), 5.11 (s, 2 H), 5.16 (s, 2 H), 6.55 (br s, 1 H), 7.02 (d, 2 H), 7.24-7.38 (m, 12 H).

1. stirringThe mixture was stirred at -40° C. for 45 minutes
2. additionWhen addition
3. stirringthe reaction mixture was stirred at -40° C. for 30 minutes
4. customThe organic layer was separated
5. washwashed with brine
6. dry with materialdried (MgSO4)
7. concentrationConcentration
8. customgave a residue which
9. customwas chromatographed on silica gel
10. washeluting with EtOAc:hexane (40:60)