dehydrogenation-based strategy for enantioselective formal benzylic C(sp3)–H bond borylation. Dehydrogenation of alkylarenes by a pincer-Ir complex produces arylalkenes via a tandem dehydrogenation/alkene-isomerization catalysis. The subsequent Cu-catalyzed asymmetric alkenehydroboration affords benzylic boronate esters with excellent site- and enantioselectivity. The generality of this strategy has
直接不对称烷基官能化可以潜在地将丰富且廉价的烃原料转化为增值的手性精细化学品。在这里,我们报告了一种基于脱氢的一锅法,用于对映选择性形式苄基 C(sp 3 )-H 键硼化。通过钳形铱络合物对烷基芳烃的脱氢通过串联脱氢/烯烃异构化催化产生芳基烯烃。随后的 Cu 催化的不对称烯烃硼氢化提供了具有优异位点和对映选择性的苄基硼酸酯。不对称烷基胺化进一步证明了该策略的普遍性。
Dehydrogenation Based Asymmetric Epoxidation of Arylalkanes to Chiral Epoxides
作者:Yiting Su、Feng Yu、Guixia Liu、Zheng Huang
DOI:10.1002/cjoc.202200304
日期:2022.10
We report herein a formal asymmetricepoxidation of arylalkanes enabled by a one-pot dual-catalysts system comprising a pincer Ir catalyst for alkane dehydrogenation-alkene isomerization (AD-ISO) and a chiral ketone catalyst for asymmetric alkene epoxidation. This protocol provides a catalytic method for the synthesis of aryl epoxides in useful yields with high regio- and stereoselectivity directly
我们在此报道了一种通过一锅双催化剂系统实现的芳基烷烃的正式不对称环氧化,该系统包括用于烷烃脱氢-烯烃异构化 (AD-ISO) 的钳形 Ir 催化剂和用于不对称烯烃环氧化的手性酮催化剂。该协议提供了一种催化方法,用于直接从容易获得的烷基芳烃中合成具有高区域和立体选择性的有用产率的芳基环氧化物。环氧化产物的立体特异性衍生允许获得各种对映体富集的化合物。
inconvenient reagents. Herein, we report a one-pot relay bicatalysis system for AAC involving (pincer)Ir-catalyzed alkane transfer dehydrogenation and Fe(OTf)3-catalyzed olefin hydroarylation. This system exhibits broad scope and is particularly effective for alkylation of arenes with arylalkanes to form 1,1-diarylalkanes with high chemo- and regioselectivity, making it potentially useful for late-stage