CS(O[CH2:6][CH2:7][C:8]1[CH:13]=[C:12]([O:14][CH3:15])[C:11]([C:16]#[N:17])=[CH:10][C:9]=1[Cl:18])(=O)=O.C1CCN2C(=NCCC2)CC1>C(Cl)Cl.C(O)(=O)CC(CC(O)=O)(C(O)=O)O>[Cl:18][C:9]1[CH:10]=[C:11]([C:16]#[N:17])[C:12]([O:14][CH3:15])=[CH:13][C:8]=1[CH:7]=[CH2:6]A solution of 2-(2-chloro-4-cyano-5-methoxyphenyl)ethyl methanesulfonate (274 mg, 0.945 mmol) in DCM (4 mL) was treated with DBU (0.712 mL, 4.73 mmol) and stirred for 3 hours at 50° C., then at RT for 12 hours. TLC (50% ethyl acetate/hexanes) showed complete conversion to a faster intense UV band for the product. The reaction was then diluted with DCM and aq. citric acid and the mixture was extracted twice with DCM. The organic layers were washed with brine, dried over sodium sulfate and concentrated in vacuo. Purification of the residue by flash chromatography (10-20% ethyl acetate/hexanes) afforded the title intermediate.
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