[CH2:1]([O:3][N:4]=[C:5]([C:11]1[CH:16]=[CH:15][C:14]([OH:17])=[CH:13][CH:12]=1)[CH2:6][C:7]([O:9][CH3:10])=[O:8])[CH3:2].[CH2:18](Br)[CH:19]=[CH2:20].C(=O)([O-])[O-].[K+].[K+].C(OCC)(=O)C>CN(C=O)C.O>[CH2:20]([O:17][C:14]1[CH:15]=[CH:16][C:11]([C:5](=[N:4][O:3][CH2:1][CH3:2])[CH2:6][C:7]([O:9][CH3:10])=[O:8])=[CH:12][CH:13]=1)[CH:19]=[CH2:18]
To a solution of crude methyl 3-(ethoxyimino)-3-(4-hydroxyphenyl)propanoate obtained from Step A at 0° C. was added allyl bromide (0.65 mL) and potassium carbonate (781 mg) in DMF (5 mL), and the resulting suspension was stirred at 0° C. for 2 h. Ethyl acetate and water were added, the aqueous layer was extracted with ethyl acetate (×3), and the combined organic layers were washed with brine, dried over anhydrous sodium sulfate, filtered, and evaporated in vacuo to give the title compound as an oil. The crude product was used in Step C without purification. HPLC retention time: 1.88 min (method A). MS (ESI) (M+H)+ 278.14.
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