Br[C:2]1[CH:10]=[C:9]2[C:5](/[C:6](=[C:12]3\[O:13][C:14]([CH3:24])([CH3:23])[C:15]([N:17]4[CH2:22][CH2:21][O:20][CH2:19][CH2:18]4)=[CH:16]\3)/[C:7](=[O:11])[NH:8]2)=[CH:4][CH:3]=1.[I-:25].[Na+].CN[C@@H]1CCCC[C@H]1NC>[Cu]I.O1CCOCC1>[CH3:23][C:14]1([CH3:24])[O:13]/[C:12](=[C:6]2/[C:7](=[O:11])[NH:8][C:9]3[C:5]/2=[CH:4][CH:3]=[C:2]([I:25])[CH:10]=3)/[CH:16]=[C:15]1[N:17]1[CH2:22][CH2:21][O:20][CH2:19][CH2:18]1
To a heavy-wall pressure tube were added (3E)-6-bromo-3-(5,5-dimethyl-4-morpholin-4-ylfuran-2(5H)-ylidene)-1,3-dihydro-2H-indol-2-one (1.6 g, 4.09 mmol), copper(I)iodide (39 mg, 0.20 mmol), sodium iodide (1.23 g, 8.18 mmol), rac-trans-N,N′-dimethylcyclohexane-1,2-diamine (58 mg, 0.41 mmol), and 20 mL of anhydrous 1,4-dioxane. The mixture was purged with nitrogen, sealed and heated in 110° C. bath for 3 days. The mixture was poured into 200 mL of water. The precipitates were filtered, washed with water and dried in vacuo to give the crude product, (3E)-3-(5,5-dimethyl-4-morpholin-4-ylfuran-2(5H)-ylidene)-6-iodo-1,3-dihydro-2H-indol-2-one, as a brown solid. Yield: 2.1 g. This crude material was used in the next step without further purification.
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