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Reagents: (a) R1COCl, PS-DIEA, 85–88%; (b) MP-B(OAc)3H, 4-(2-keto-1-benzoimidazolinyl)piperidine or 5-chloro-1-(4-piperidinyl)-2-benzimidazolone, DCM, rt, 24 hr, 85–95%. All compounds purified by mass-directed HPLC to analytical purity (>98%).
