The macrocyclic lactam alkaloid (±)-(2R*,3R*)-3-hydroxycelacinnine (1) derived from spermidine was synthesized via stereoselective epoxide-ring opening with magnesium azide and cesium carbonate promoted macrocyclization of the ditosylated diamino precursor 12 with 1,4-dibromobutane in the two key steps (Scheme 2). 1H- and 13C-NMR Signal assignments from COSY, HSQC, and HMBC 2D NMR data of the synthesized