An unprecedent gem‐carboborylation of aldehydes and ketones provides access to various secondary and tertiary alkyl boronic esters. The addition of B₂pin₂ to a carbonyl compound generates α‐oxyl‐substituted alkyl boron species. Organolithium and Grignard reagents are then applied as C nucleophiles for the 1,2‐metalate rearrangement process. The organolithium reagents can also be generated by C−H lithiation or halogen/lithium exchange. The use of chiral ligands led to the generation of chiral alkyl boronic esters in enantioenriched form, demonstrating that the enantioselectivity of this transformation is catalyst‐controlled.

中文翻译：

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宝石-碳硼化反应合成仲和叔烷基硼酸酯：羰基化合物的双（亲电子基）当量

醛和酮具有前所未有的宝石碳羰基化作用，可以使用各种仲和叔烷基硼酸酯。将B ₂ pin ₂加到羰基化合物上可生成α-氧基取代的烷基硼。然后将有机锂和格氏试剂用作C-亲核试剂，用于1,2-金属酸盐重排过程。有机锂试剂也可以通过CH锂化或卤素/锂交换生成。手性配体的使用导致了对映体富集形式的手性烷基硼酸酯的生成，表明这种转化的对映选择性是由催化剂控制的。