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Two methods for the synthesis of N,19-seco norditerpenoid alkaloids were developed. One method prepared new N,19-seco norditerpenoid alkaloids possessing an oxaziridine group from yunaconitine in five steps involving acetylation, imination, quaternization, formation of N,O-mixed ketal, and oxidation in 50% overall yield. Another method provided a series of novel N,19-seco norditerpenoid alkaloids...
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