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Synthesis of bicyclic DKP derivatives. The closure of the DKP ring preceded the RCM reaction. DMB = 2,4-(MeO)2 PhCH2. Reagents and conditions: (i) piperidine–CH2 Cl2 1: 4, rt, 42%; (ii) 37 (0.2 mM), second generation Grubbs catalyst, CH2 Cl2, rt, 21% (20), 43% (38); 37 (40 mM), 79% (38).
