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a) N-(4-bromobutyl)phthalimide, K2CO3, cat. KI, ACN, 82 ° C, overnight; b) hydrazine (NH2NH2), ethanol (EtOH), 80 ° C, 3 hrs, 94% (over 2 steps); c) N,N-dimethyl-4-oxo-2,2-diphenylbutanamide (26), cat. AcOH, STAB, DCE, 25 ° C, 2.5 hrs, 46%.
