反应详情

A stirred solution of (1S,3R)-3-acetyl-2,2-dimethylcyclobutanecarboxylic acid (6.0 g, 35.29 mmol) in DMF (20 ml) at 0° C., Cs2CO3 (13.8 g, 42.34 mmol) followed by BnBr (5.06 ml, 42.34 mmol) were added slowly portion wise. The reaction was stirred at room temperature for about 2 hours. After completion of the reaction (monitored by TLC), the reaction mixture was diluted with EtOAc (100 ml) and washed with water (50 ml), brine (50 ml) and dried with Na2SO4. The solvent was evaporated and purified by silica gel column (60-120, elution 4% EtOAc in hexane) to afford title compound as a pale yellow syrup. Wt: 5.6 g; Yield: 61.5%; 1H NMR (300 MHZ, CDCl3): δ 7.42-7.31 (m, 5H), 5.13 (s, 2H), 2.93-2.81 (m, 2H), 2.68 (q, 1H, J=10.5 Hz,), 2.05 (s, 3H), 1.97-1.88 (m, 1H), 1.43 (s, 3H), 0.87 (s, 3H); Mass: [M+1]+ 261 (20%), [M+Na]+ 283 (87%); IR (KBr, cm−1): 2889, 1732, 1708, 1498, 1456, 1329, 1279, 1183, 1027, 954, 752, 698.

1. customat 0° C.
2. additionwere added slowly portion wise
3. customAfter completion of the reaction (monitored by TLC)
4. washwashed with water (50 ml), brine (50 ml)
5. dry with materialdried with Na2SO4
6. customThe solvent was evaporated
7. custompurified by silica gel column (60-120, elution 4% EtOAc in hexane)