3 years ago

Pd-Catalyzed Regio- and Stereoselective C-Nucleoside Synthesis from Unactivated Uracils and Pyranoid Glycals

Pd-Catalyzed Regio- and Stereoselective C-Nucleoside Synthesis from Unactivated Uracils and Pyranoid Glycals
Debaraj Mukherjee, Faheem Rasool
Pd-catalyzed regio- and stereoselective C-nucleoside synthesis from pyranoid glycals and unactivated N,N-dialkyluracils is described. Depending upon the reaction conditions, either β-hydride or β-heteroatom eliminated C-nucleosides were obtained exclusively. Different glycals with various protecting groups reacted smoothly. Mechanistically, uracil first undergoes electrophilic palladation regioselectively at the C-5 position to generate the active organopalladium species, which then attacks the glycal in a regio- and stereoselective mode to generate C-nucleosides. The method obviates the use of heavy metals such as mercury or preactivation of protected uracils, making it an attractive strategy for C-nucleoside synthesis.

Publisher URL: http://dx.doi.org/10.1021/acs.orglett.7b02402

DOI: 10.1021/acs.orglett.7b02402

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