反应详情

To ethyl 6,6,6-trifluorohex-2-enoate a6 (54.42 g, 0.277 mol, 1 eq) in nitromethane (250 ml) is added in one portion 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU, 41.5 ml, 0.277 mol, 1 eq). The reaction mixture is stirred at room temperature for 3 hours, then the nitromethane layer is washed two times a 2N HCl aqueous solution (250 ml). The cumulated aqueous layers are extracted by ethyl acetate (2×250 ml). The cumulated organic layers are dried over MgSO4, filtered and condensed under vacuum to yield 50 g of crude ethyl 6,6,6-trifluoro-3-(nitromethyl)hexanoate a7 which is used in the next step without any further purification.

1. washthe nitromethane layer is washed two times a 2N HCl aqueous solution (250 ml)
2. extractionThe cumulated aqueous layers are extracted by ethyl acetate (2×250 ml)
3. dry with materialThe cumulated organic layers are dried over MgSO4
4. filtrationfiltered
5. customcondensed under vacuum