C(O[C:4](=[O:17])/[C:5](/[C:15]#[N:16])=[CH:6]\[NH:7][C:8]1[CH:13]=[CH:12][C:11]([I:14])=[CH:10][CH:9]=1)C.C(OC(=O)/C(/C#N)=C/NC1C=CC(I)=CC=1)C.CCOCC>C1(OC2C=CC=CC=2)C=CC=CC=1>[I:14][C:11]1[CH:12]=[C:13]2[C:8](=[CH:9][CH:10]=1)[NH:7][CH:6]=[C:5]([C:15]#[N:16])[C:4]2=[O:17]A mixture of (Z)-2-cyano-3-(4-iodo-phenylamino)-acrylic acid ethyl ester and (E)-2-cyano-3-(4-iodo-phenylamino)-acrylic acid ethyl ester (example 14a, 150 g, 0.44 mol) in diphenylether (1500 mL) was refluxed at 260° C. for 12 h. After cooling, ether was added. The solid was collected by filtration, washed with ether and dried to obtain 6-iodo-4-oxo-1,4-dihydro-quinoline-3-carbonitrile (110.5 g, 85%) as a black solid. LC-MS m/e 297 (MH+).
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