Iron-Catalyzed Hydroboration: Unlocking Reactivity through Ligand Modulation
作者:Maialen Espinal-Viguri、Callum R. Woof、Ruth L. Webster
DOI:10.1002/chem.201602818
日期:2016.8.8
hydroboration (HB) of alkenes and alkynes is reported. A simple change in ligand structure leads to an extensive change in catalyst activity. Reactions proceed efficiently over a wide range of challenging substrates including activated, unactivated and sterically encumbered motifs. Conditions are mild and do not require the use of reducing agents or other additives. Large excesses of borating reagent are not required
Iron-Catalyzed, Markovnikov-Selective Hydroboration of Styrenes
作者:Xu Chen、Zhaoyang Cheng、Zhan Lu
DOI:10.1021/acs.orglett.7b00227
日期:2017.3.3
A highly Markovnikov-selective, iron-catalyzed hydroboration of styrenes is reported using available oxazolinylphenyl picolinamide as the ligand to afford the branched hydroboration products with up to >50/1 b/l. This reaction is operationally simple and could be carried out in gram scale.
据报道,使用可用的恶唑啉基苯基吡啶甲酸酰胺作为配体,对苯乙烯进行了高度马尔科夫尼科夫选择性铁催化的硼氢化反应,以提供最高> 50/1 b / l的支链硼氢化产物。该反应操作简单,可以以克为单位进行。
Catalytic Alkene Hydroboration Mediated by Cationic and Formally Zwitterionic Rhodium(I) and Iridium(I) Derivatives of a P,N-Substituted Indene
作者:Judy Cipot、Christopher M. Vogels、Robert McDonald、Stephen A. Westcott、Mark Stradiotto
DOI:10.1021/om060742m
日期:2006.12.1
Cationic (2a,b) and formally zwitterionic (3a,b) Rh(I) and Ir(I) complexes supported by P,N-substituted indene or indenide ligands (respectively) have been employed in the selective hydroboration of substituted vinylarenes with pinacolborane (HBpin, pin = 1,2-O2C2Me4). Notably, 3a,b exhibited remarkably high, but differing, selectivities in the hydroboration of 1-phenylpropene.
分别由P,N-取代的茚或茚配体负载的阳离子(2a,b)和正式的两性离子(3a,b)Rh(I)和Ir(I)配合物已用于频哪醇硼烷的选择性乙烯基芳烃的选择性硼氢化反应中(HBpin,pin = 1,2-O 2 C 2 Me 4)。值得注意的是,3a,b在1-苯基丙烯的硼氢化中表现出显着高的选择性,但是不同。
Palladium-catalyzed regioselective hydroboration of aryl alkenes with B<sub>2</sub>pin<sub>2</sub>
A palladium(II)-catalyzed hydroboration of aryl alkenes with stable and easy-to-handle (pinacolato)diboron (B2pin2) under mild conditions has been developed. Acetic acid acted as the solvent and the hydrogen source, which has been identified by deuterium experiments. Notably, isomerization–hydroboration of allyl benzene derivatives was observed. As a result, a series of benzyl boronic esters were obtained
Catalytic Boration of Alkyl Halides with Borane without Hydrodehalogenation Enabled by Titanium Catalyst
作者:Xianjin Wang、Penglei Cui、Chungu Xia、Lipeng Wu
DOI:10.1002/anie.202100569
日期:2021.5.25
titanium‐catalyzed boration of alkyl (pseudo)halides (alkyl‐X, X=I, Br, Cl, OMs) with borane (HBpin, HBcat) is reported. The use of titanium catalyst can successfully suppress the undesired hydrodehalogenation products that prevail using other transition‐metal catalysts. A series of synthetically useful alkyl boronate esters are readily obtained from various (primary, secondary, and tertiary) alkyl electrophiles,