Abstract
ABSTRACTFrom a series of bis(alkynyl)mesityl phosphanes 5, we prepared phosphirenium borate compounds 6 in high yields by reaction with B(C6F5)3 at room temperature. The zwitterionic compounds 6 are conveniently accessible and can be obtained with unique substitution patterns by this route. For two examples, we show the conversion of 6 to the respective 3‐borylated phosphole derivatives 7 through multiple 1,1‐carboboration reactions. In a useful one‐pot methodology, the phosphirenium borates 6 are converted to air‐stable 3‐arylated phospholes 8 by a sequential 1,1‐carboboration/ Suzuki–Miyaura type cross‐coupling reaction.
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