Abstract

We report a general preparation of arylated bicyclo[1.1.1]pentanes through the opening of [1.1.1]propellane with various arylmagnesium halides. After transmetalation with ZnCl2 and Negishi cross-coupling with aryl and heteroaryl halides, bis-arylated bicyclo[1.1.1]pentanes are obtained. These bis-arylated bicyclo[1.1.1]pentanes may be considered as bioisosteres of internal alkynes. Bioisosteres of tazarotene and the metabotropic glutamate receptor 5 (mGluR5) antagonist 2-methyl-6-(phenylethynyl)pyridine were prepared and their physicochemical properties were evaluated.

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