[Br:1][C:2]1[CH:10]=[CH:9][CH:8]=[CH:7][C:3]=1[C:4]([OH:6])=[O:5].C1CCC(N=C=NC2CCCCC2)CC1.C(Cl)Cl.[C:29](O)([CH3:32])([CH3:31])[CH3:30]>CN(C1C=CN=CC=1)C>[C:29]([O:5][C:4](=[O:6])[C:3]1[CH:7]=[CH:8][CH:9]=[CH:10][C:2]=1[Br:1])([CH3:32])([CH3:31])[CH3:30]2-Bromobenzoic acid (203.2 g, 1011 mmol) was added to a solution of 1.0 M DCC in DCM (1011 mL, 1011 mmol) and cooled at 0° C. DMAP (11.36 g, 93.0 mmol) and t-butyl alcohol (106.3 mL, 1112 mmol) were added and the mixture was stirred at room temperature for 10 minutes, then warmed to room temperature and stirred overnight. The mixture was then filtered, washed with saturated NaHCO3 (200 mL), saturated aqueous NaCl, dried over MgSO4, filtered and concentrated under reduced pressure to yield compound A as a clear oil (168.4 g).
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