An efficient method for the metal‐free deaminative borylation of alkylamines, using bis(catecholato)diboron as the boron source, to directly synthesize various alkyl potassium trifluoroborate salts is introduced. The key to this high reactivity is the utilization of pyridinium salt activated alkylamines, with a catalytic amount of a bipyridine‐type Lewis base as a promoter. This transformation shows good functional‐group compatibility (e.g., it is unimpeded by the presence of a ketone, indole, internal alkene, or unactivated alkyl chloride) and can serve as a powerful synthetic tool for borylation of amine groups in complex compounds. Mechanistic experiments and computations suggest a mechanism in which the Lewis base activated B₂cat₂ unit intercepts an alkyl radical generated by single‐electron transfer (SET) from a boron‐based reductant.

中文翻译：

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Lewis碱促进的烷基胺的选择性CN硼氢化

引入了一种有效的方法，以双（邻苯二酚）二硼作为硼源，直接合成各种三氟硼酸烷基钾盐，从而实现烷基胺的无金属脱氨基硼化。如此高的反应活性的关键是利用吡啶盐活化的烷基胺，并以催化量的联吡啶型路易斯碱作为促进剂。这种转变显示出良好的官能团相容性（例如，不受酮，吲哚，内部烯烃或未活化的烷基氯的存在的阻碍），并且可以用作复杂化合物中胺基的硼酸酯化的强大合成工具。力学实验和计算表明了一种机制，其中路易斯碱激活了B ₂ cat ₂ 单元截获由硼还原剂单电子转移（SET）产生的烷基。