Copper-Mediated Difunctionalization of Alkenylboronic Acids: Synthesis of ɑ-Imino Ketones
作者:Ji-Wen Jiao、Hong-Yan Bi、Pei-Sen Zou、Zhi-Xin Wang、Cui Liang、Dong-Liang Mo
DOI:10.1002/adsc.201800718
日期:2018.9.3
Various ɑ‐imino ketones were prepared in good yields through a copper‐mediated difunctionalization of alkenylboronic acids with benzotriazolamine in air. Mechanistic studies showed that ɑ‐imino ketonesformation occurred through an initial copper‐mediated coupling reaction to form an enamine, followed by homolysis of the C−Cu bond to produce an ɑ‐radical imine, and finally radical oxidation by air. The
<scp>Cobalt‐Catalyzed</scp>
Enantioselec tive
<scp>Ring‐Opening</scp>
Reactions of Oxa‐ and Aza‐bicyclic Alkenes with Alkenylboronic Acids
作者:Di Zhu、Yongmei Zhao、Qinglei Chong、Fanke Meng
DOI:10.1002/cjoc.202100622
日期:2022.1.15
Catalytic enantioselective ring-opening of oxa- and aza-bicyclic alkenes with readily available accessible alkenylboronic acids, promoted by a chiral phosphine–Co complex, is reported. Such a process represents the unprecedented Co-catalyzed introduction of various alkenyl groups onto the oxa- and aza-bicyclic alkenes, affording a widerange of multisubstituted functionalized cyclohexenes in up to
据报道,在手性膦-钴配合物的促进下,氧杂和氮杂双环烯烃与容易获得的烯基硼酸催化对映选择性开环。这样的过程代表了前所未有的将各种烯基引入氧杂-和氮杂-双环烯烃上,以高达 98% 的收率和 99.5:0.5 er 提供范围广泛的多取代官能化环己烯。
Rhodium-Catalyzed Asymmetric Conjugate Addition of Arylboroxines to Borylalkenes: Asymmetric Synthesis of β-Arylalkylboranes
作者:Keigo Sasaki、Tamio Hayashi
DOI:10.1002/anie.201004980
日期:2010.10.25
Asymmetricconjugateaddition of arylboroxines to borylalkenes proceed in the presence of a chiral bisphosphine/rhodium complex as a catalyst to give chiral β‐arylalkylboranes with high enantioselectivities (see scheme). [O]=H2O2/NaOH.
在手性双膦/铑配合物作为催化剂的存在下,芳基硼氧烷与硼烷基烯烃的不对称共轭加成反应产生具有高对映选择性的手性β-芳基烷基硼烷(参见方案)。[O] = H 2 O 2 / NaOH。