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Chemo-, regio-, and stereoselective cobalt-mediated [2+2+2] cycloaddition of alkynyl boronates to alkenes: 1,3- and 1,4-Diboryl-1,3-cyclohexadienes

Gandon, V. ; Leboeuf, D. ; Amslinger, S. ; Vollhardt, K. P. C. ; Malacria, M. ; Aubert, C.


Diborylated compounds are obtained by means of CpCo-mediated cocyclization of alkynyl(pinacol)boronic esters to alkenes followed by oxidative demetalation (see scheme). This strategy for the rapid and efficient construction of highly functionalized 1,3-cyclohexadienes and arenes is compatible with various substrates.

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