[F:1][C:2]([F:9])([F:8])[C:3]([O:5]CC)=O.[H-].[Na+].[Cl:12][C:13]1[CH:18]=[CH:17][CH:16]=[C:15]([C:19](=[O:21])[CH3:20])[N:14]=1.C1OCCOC2C(=CC=CC=2)OCCOCCOC2C(=CC=CC=2)OC1.Cl>C1COCC1.C(O)C>[Cl:12][C:13]1[CH:18]=[CH:17][CH:16]=[C:15]([C:19](=[O:21])[CH2:20][C:3]([C:2]([F:1])([F:8])[F:9])=[O:5])[N:14]=1To a mixture of ethyl trifluoroacetate (17.2 g) and sodium hydride (60% in oil, 5.7 g) in THF (200 ml) is added a solution of 1A (11.2 g) in THF (50 ml) with ethanol (2 drops) and a solution of dibenzo-18-crown-6 (415 mg) in THF (70 ml). The reaction mixture is stirred for 60 h at ambient temperature. After heating for 1 h at reflux temperature, the mixture is acidified with 2M hydrochloric acid and extracted with ethyl acetate. The organic phase is dried and evaporated. One obtains the crude title compound as an oily product (21.5 g).
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