反应详情

温度

-78 °C

At ambient temperature, to a stirred suspension containing 3,5-diisopropyl-p-anisic acid (1.95 g, 8.23 mmol, RN-117439-59-5) and oxalyl chloride (0.8 mL, 9.20 mmol) in CH2Cl2 (22.5 mL) was added N,N-dimethylformamide (2 drops). After 2 h, the reaction was cooled to −78° C. To the reaction was added tin (IV) chloride (1.05 mL) followed by a solution of 2-benzyl-4,5-dimethylfuran (1.8 g, 9.68 mmol) in CH2Cl2 (10.0 mL). After the additions were complete, the reaction was allowed to warm to ambient temperature and stirred for 24 h. The reaction was quenched into crushed ice (100 g), diluted with sat. aq. KH2PO4 (100 mL) and extracted with ether. The combined ethereal extracts were washed with sat aq. NaHCO3 (2×60 mL), with brine (1×60 mL), dried (Na2SO4) and concentrated. The crude product was purified on Biotage KP-Sil eluting with 1% EtOAc/pet. ether to give 2.07 g, (62%) of the title compound as an oil; 1H NMR (DMSO-d6) δ 1.17 (d, 12H), 1.81 (s, 3H), 2.19 (s, 3H), 3.29 (septet, 2H), 3.74 (s, 3H), 3.84 (s, 2H), 7.01-7.03 (m, 2H), 7.16-7.25 (m, 3H), 7.47 (s, 2H). mass spectrum (EI), m/z 404 (M+). Anal. Calcd. for C27H32O3.0.6H2O: C, 78.07; H, 8.06; N, 0.00. Found: C, 78.04; H, 7.93; N, −0.02.

1. temperatureto warm to ambient temperature
2. customThe reaction was quenched
3. custominto crushed ice (100 g)
4. additiondiluted with sat. aq. KH2PO4 (100 mL)
5. extractionextracted with ether
6. washThe combined ethereal extracts were washed with sat aq. NaHCO3 (2×60 mL), with brine (1×60 mL)
7. dry with materialdried (Na2SO4)
8. concentrationconcentrated
9. customThe crude product was purified on Biotage
10. washKP-Sil eluting with 1% EtOAc/pet. ether