[Mg].Br[C:3]1[CH:8]=[CH:7][C:6]([O:9][CH3:10])=[CH:5][CH:4]=1.[Cl:11][C:12]1[CH:13]=[C:14]2[C:18](=[CH:19][CH:20]=1)[NH:17][C:16](=[O:21])[C:15]2=[O:22]>C1COCC1>[Cl:11][C:12]1[CH:13]=[C:14]2[C:18](=[CH:19][CH:20]=1)[NH:17][C:16](=[O:21])[C:15]2([OH:22])[C:3]1[CH:8]=[CH:7][C:6]([O:9][CH3:10])=[CH:5][CH:4]=1This compound is prepared according to the procedure described in step A of Preparation 1.3 starting with 3.5 g of magnesium, 25 g of 1-bromo-4-methoxybenzene, 50 ml of THF and a mixture of 8 g of 5-chloro-1H-indol-2,3-dione in 50 ml of THF. 9.3 g of the expected product are obtained after crystallization from hot iso ether; m.p.=202° C.
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