Organic Letters
Organic Letters
5 years ago

Tandem Oxidative Dearomatizing Spirocyclizations of Propargyl Guanidines and Ureas

Tandem Oxidative Dearomatizing Spirocyclizations of Propargyl Guanidines and Ureas
Jayanta Das, Carl J. Lovely, Ravi P. Singh, Muhammed Yousufuddin, Delphine Gout
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.

Publisher URL: http://dx.doi.org/10.1021/acs.orglett.7b01898

DOI: 10.1021/acs.orglett.7b01898

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