Ethyl diethoxyacetate → HCID 178471714、化合物

反応式

[Cl:1][C:2]1[CH:3]=[C:4]([C:9](=[O:11])[CH3:10])[CH:5]=[CH:6][C:7]=1[F:8].[CH2:12]([O:14][CH:15]([O:21][CH2:22][CH3:23])[C:16](OCC)=[O:17])[CH3:13].[Li+].CC([N-]C(C)C)C>C1COCC1>[Cl:1][C:2]1[CH:3]=[C:4]([C:9](=[O:11])/[CH:10]=[C:16](\[OH:17])/[CH:15]([O:21][CH2:22][CH3:23])[O:14][CH2:12][CH3:13])[CH:5]=[CH:6][C:7]=1[F:8]

参加物

実験手順

To a −78° C. solution of 1-(3-chloro-4-fluorophenyl)ethanone (16.25 g, 94 mmol) and ethyl 2,2-diethoxyacetate (20.73 mL, 113 mmol) in THF (392 mL) was added, dropwise, a solution of LDA (51.8 mL, 104 mmol, 2M in THF). The resultant reaction mixture was gradually allowed to reach room temperature and continued stirring for 16 h. The reaction was carefully quenched with water and diluted with EtOAc. The two layers were separated and the aq. layer was extracted with EtOAc (2×150 mL) The combined organic layer was washed with brine, dried over anhydrous MgSO4, filtered and the filtrate was concentrated under reduced pressure to provide a crude oil. It was purified by silica gel chromatography (1500 g Commodity column, eluting with a 10% EtOAc in hexanes). Fractions containing the product were combined and evaporated to afford Intermediate A39A (9.97 g, 35%) as a solid. MS(ES): m/z=257 [M-OEt]+.