反应详情

To a stirred solution of 3-oxocyclopentanecarboxylic acid (1.5 g, 11.71 mmol) in DMF (20 mL) was added K2CO3 (1.780 g, 12.88 mmol) followed by benzyl bromide (1.360 mL, 11.71 mmol) under nitrogen. The reaction mixture was then stirred for 18 h at RT. The reaction mixture was poured into water (100 mL) and extracted with ethyl acetate (2×100 mL). The combined organic layer was washed with brine, dried over anhydrous Na2SO4 and concentrated under reduced pressure. The crude compound was purified by silica gel chromatography (12 g REDISEP® column, eluting with 20% EtOAc in hexane). Fractions containing the product were combined and evaporated to afford Intermediate 332A (2.1 g, 78% yield) as an oil. 1H NMR (400 MHz, chloroform-d) δ ppm 7.42-7.31 (m, 5H), 5.16 (s, 2H), 3.22-3.12 (m, 1H), 2.58-2.45 (m, 2H), 2.44-2.29 (m, 2H), 2.23 (s, 2H).

1. extractionextracted with ethyl acetate (2×100 mL)
2. washThe combined organic layer was washed with brine
3. dry with materialdried over anhydrous Na2SO4
4. concentrationconcentrated under reduced pressure
5. customThe crude compound was purified by silica gel chromatography (12 g REDISEP® column, eluting with 20% EtOAc in hexane)
6. additionFractions containing the product
7. customevaporated