N[C:2]1[C:12](/C=C/C(OC)=O)=[CH:11][C:10](Br)=[C:4]2[C:5]([NH:7][C:8](=[O:9])[C:3]=12)=[O:6].C(N(CC)CC)C>C(#N)C.C([O-])(=O)C.[Pd+2].C([O-])(=O)C.C1(C)C=CC=CC=1P(C1C=CC=CC=1C)C1C=CC=CC=1C>[C:8]1(=[O:9])[NH:7][C:5](=[O:6])[C:4]2=[CH:10][CH:11]=[CH:12][CH:2]=[C:3]12In a similar manner to Step 2 of Example 1, (E)-3-amino-4-(2-methoxycarbonylvinyl)-6-bromophthalimide (100 mg, 0.308 mmol) was dissolved in acetonitrile (7 mL), and the solution was treated with Compound BB (292 mg, 0.616 mmol), palladium acetate (5.5 mg, 0.025 mmol), tri(o-tolyl)phosphine (15 mg, 0.049 mmol) and triethylamine (0.429 mL, 3.08 mmol), followed by purification by preparative thin-layer chromatography (chloroform/acetonitrile=6/1) to obtain (E)-3-amino-4-(2-methoxycarbonylvinyl)-6-(tert-butoxycarbonyl)-5-[4-(tert-butoxycarbonyl)piperazin-1-ylcarbonyl]indol-2-yl)phthalimide (102 mg, yield 49%).
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