空气稳定的双(辛酸镍(II)镍(II),Ni(O 2 CC 7 H 15)2和α-二亚胺配体,iPr DI或Cy ADI(iPr DI = [2,6- i Pr 2 -C 6 H ^ 3 N = C(CH 3)] 2,赛扬ADI = [C 6 H ^ 11 N = C(CH 3)] 2)与频哪醇硼烷(HBPin)生成用于氢化受阻,基本未官能化的烯烃的高活性催化剂。氢化了一系列的三和四取代的烯烃,并证明了以数克为单位的1-苯基-1-环己烯氢化的台式操作程序,代表了这种挑战性类别的镍催化氢化反应的催化剂活性和范围的进步。烯烃。用iPr DI用原位生成的镍催化剂对1,2-二甲基茚进行氘化可独家提供1,2- syn - d 2-二甲基茚满。使用环状三取代烯烃(例如1-甲基茚和甲基环己烯),在D 2的4 atm下用原位生成的镍催化剂进行氘化产生了烷烃的多个氘代同位素,这标志着与生产性氢化竞争的链运行
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。
Cobalt-Catalyzed Hydroboration of Alkenes, Aldehydes, and Ketones
作者:Sem Raj Tamang、Deepika Bedi、Sara Shafiei-Haghighi、Cecilia R. Smith、Christian Crawford、Michael Findlater
DOI:10.1021/acs.orglett.8b02775
日期:2018.11.2
An operationally convenient and general method for hydroboration of alkenes, aldehydes, and ketones employing Co(acac)3 as a precatalyst is reported. The hydroboration of alkenes in the presence of HBpin, PPh3, and NaOtBu affords good to excellent yields with high Markovnikov selectivity with up to 97:3 branched/linear selectivity. Moreover, Co(acac)3 could be used effectively to hydroborate aldehydes
报道了使用Co(acac)3作为预催化剂对烯烃,醛和酮进行氢硼化的操作方便且通用的方法。在HBpin,PPh 3和NaO t Bu存在下,烯烃进行硼氢化可提供良好的产率,并具有高的马尔可夫尼科夫选择性和高达97:3的支链/线性选择性。而且,在温和的反应条件下,在不存在添加剂的情况下,Co(acac)3可有效地用于硼氢化醛和酮。醛基的分子间和分子内化学选择性还原发生在酮官能团之上。
Catalytic regeneration of a Th–H bond from a Th–O bond through a mild and chemoselective carbonyl hydroboration
作者:Tapas Ghatak、Konstantin Makarov、Natalia Fridman、Moris S. Eisen
DOI:10.1039/c8cc05030a
日期:——
Here we present an unprecedented chemoselectivehydroboration for aldehydes and ketones catalysed by actinides. The reaction features a very low catalyst loading (0.1–0.004 mol%) and quantitative product formation in less than 15 minutes, at room temperature. Thermodynamic and kinetic studies including stoichiometric and labeling studies with deuterated pinacolborane allow us to propose a plausible
Mechanism-Based Enantiodivergence in Manganese Reduction Catalysis: A Chiral Pincer Complex for the Highly Enantioselective Hydroboration of Ketones
作者:Vladislav Vasilenko、Clemens K. Blasius、Hubert Wadepohl、Lutz H. Gade
DOI:10.1002/anie.201704184
日期:2017.7.10
A manganese alkyl complex containing a chiralbis(oxazolinyl‐methylidene)isoindoline pincer ligand is a precatalyst for a catalytic system of unprecedented activity and selectivity in the enantioselective hydroboration of ketones, thus producing preparatively useful chiral alcohols in excellent yields with up to greater than 99 % ee. It is applicable for both aryl alkyl and dialkyl ketone reduction
含有手性双(恶唑啉基-亚甲基)异二氢吲哚钳位配体的锰烷基络合物是酮对映选择性氢硼化反应中空前的活性和选择性的催化体系的预催化剂,从而以高达99的高收率生产了制备有用的手性醇。 %ee。它适用于在温和的反应条件下(TOF> 450 h -1在-40°C下)。富含地球的贱金属催化剂在极低的催化剂负载量(低至0.1 mol%)下运行,并且具有很高的官能团耐受性。有证据表明存在两种不同的锰催化氢化物转移机理,并介绍了它们在选择性确定步骤中对映体控制的作用。
Dramatic Effect of Lewis Acids on the Rhodium-Catalyzed Hydroboration of Olefins
作者:Christopher J. Lata、Cathleen M. Crudden
DOI:10.1021/ja904142m
日期:2010.1.13
The addition of Lewisacids such as trispentafluoroboron as cocatalysts has been found to have a dramatic effect on the Rh-catalyzed hydroboration of olefins with pinacol borane. For example, aliphatic olefins do not react at all in noncoordinating solvents, but with the addition of 2% of B(C(6)F(5))(3), the reaction is complete in minutes. Similarly, the reaction of aromatic olefins with HBPin occurs