反应详情

A stirred solution of methyl 2-oxocyclopentanecarboxylate (4.26 g, 30 mmol) and allyl alcohol (10.2 mL, 150 mmol) in anhydrous toluene (25 mL) was treated with powdered zinc (0.40 g, 6 mmol), refluxed for 48 h, and cooled to room temperature. The suspension was filtered, the filter cake rinsed with toluene, and the filtrate concentrated to afford allyl 2-oxocyclopentanecarboxylate (5.01 g, 99%) as a colorless oil. 1H NMR (CDCl3, 300 MHz) δ 5.89 (ddt, J1=15.9 Hz, J2=10.5 Hz, J3=4.8 Hz, 1 H), 5.33 (dtd, J1=15.9 Hz, J2=2.7 Hz, J3=1.4 Hz, 1 H), 5.23 (dtd, J1=10.5 Hz, J2=2.7 Hz, J3=1.4 Hz, 1 H), 4.83-4.75 (m, 1 H), 3.18 (t, J=9.0 Hz, 1 H), 2.41-2.23 (m, 4 H), 2.22-2.07 (m, 1 H), 1.94-1.80 (m, 1 H); MS (+CI): m/z for C9H12O3: expected 168.1; found 169.1 (M+H)+.

1. temperaturerefluxed for 48 h
2. filtrationThe suspension was filtered
3. washthe filter cake rinsed with toluene
4. concentrationthe filtrate concentrated