The copper-catalyzed sequential hydroboration of terminal alkynes with pinacolborane to prepare 1,1-diborylalkanes directly from alkynes was studied. Protected propargyl amines, propargyl alcohol derivatives, and simple alkynes regioselectively produced the desired 1,1-diborylalkanes in good yields with a copper/xantphos catalyst.
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Lee et al. (2014) studied this question.
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