Two new synthesis methods were established, N-tetrazole and N-1,3,4-oxadiazole substituted heterocyclic derivatives of sinomenine were constructed on the N atom of D-ring, and 34 new sinomenine heterocyclic derivatives were synthesized. N-CN sinomenine at 17-position was generated by substituted reaction between cyanogen bromide and sinomenine, and then N-tetrazole sinomenine was achieved by 1,3-dipolar cycloaddition reaction with NaN₃. The reaction of tetrazole with benzyl chloride produced N-tetrazole heterocyclic derivatives of sinomenine. N-1,3,4-Oxadiazole heterocyclic derivatives of sinomenine were obtained by acylation reaction and the Huisigen rearrangement reaction of tetrazole with acyl chloride reagents. These methods with mild condition gave good to excellent yields. This method provides new methods for structural modification of natural products, the synthesized compounds expand the library of sinomenine derivatives, and this work provides a basis study for drug molecular design and potential activity study.

Key words: sinomenine, tetrazole, oxadiazole, derivative