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Tandem Oxidative Dearomatizing Spirocyclizations of Propargyl Guanidines and Ureas.
Org Lett
August 2017
Department of Chemistry and Biochemistry, University of Texas-Arlingon, Arlington, Texas 76019-0065, United States.
Treatment of propargyl ureas or guanidines with iodosobenzene diacetate results in an oxidative tandem amination/etherification dearomatizing spirocyclization. This transformation leads directly to the complete framework of the Leucetta alkaloids, spirocalcaridine A and B.
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