Scheme 1.
Building block synthesis for the marine natural product bisebromoamide 5. Reagents and Conditions: (a) NBS (100 mol %), In(OTf)3 (10 mol %), MeCN, rt, 10 min; (b) NBS (100 mol %), pTsOH (10 mol %), EtOAc, rt, 30 h.
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