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- [24] A novel [3+2] cycloaddition approach to nitrogen heterocycles via phosphine-catalyzed reactions of 2,3-butadienoates or 2-butynoates and dimethyl acetylenedicarboxylate with imines: A convenient synthesis of pentabromopseudilin JOURNAL OF ORGANIC CHEMISTRY, 1998, 63 (15): : 5031 - 5041