A straightforward and ligand-free manganese-catalyzed protocol for the chemo- and stereoselective hydroborylation of alkynes with HBpin is demonstrated. This atom-economical reaction is highly selective for the synthesis of (E)-alkenylboronates, and tolerates important functionalities, including halides, ether, alkenyl, silyl and thiophenyl groups. A preliminary mechanistic study supports the involvement of a metal-hydride intermediate.

中文翻译：

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无配体 MnBr2 催化末端炔烃的化学和立体选择性硼氢化

展示了一种简单且无配体的锰催化方案，用于使用 HBpin 对炔烃进行化学和立体选择性硼氢化反应。这种原子经济反应对于 ( E )-烯基硼酸酯的合成具有高度选择性，并且能够耐受重要的官能团，包括卤化物、醚、烯基、甲硅烷基和苯硫基。初步的机理研究支持金属氢化物中间体的参与。