C1CCC(N=C=NC2CCCCC2)CC1.C(Cl)Cl.[Br:19][C:20]1[CH:28]=[CH:27][CH:26]=[CH:25][C:21]=1[C:22]([OH:24])=[O:23].[C:29](O)([CH3:32])([CH3:31])[CH3:30]>CN(C1C=CN=CC=1)C>[C:29]([O:23][C:22](=[O:24])[C:21]1[CH:25]=[CH:26][CH:27]=[CH:28][C:20]=1[Br:19])([CH3:32])([CH3:31])[CH3:30]To a solution of DCC (32.8 g, 159 mmol) in DCM (200 mL, 2 mol) was added 2-bromobenzoic acid (32.0 g, 159 mmol) followed by DMAP (1.8 g, 15 mmol) and t-butyl alcohol (15.2 mL, 159 mmol). The mixture was stirred at room temperature for 16 hours, then filtered. The organic was washed with saturated NaHCO3 (200 mL), saturated aqueous NaCl, dried over MgSO4, filtered and concentrated under reduced pressure to yield compound A as an oil (41.6 g).
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