CO 2的化学固定受到了广泛的关注。特别是与CO 2催化形成C-C键生成羧酸具有重要意义。在CO 2固定方法中,多重羧化是具有挑战性的课题之一。在这里,我们研究了多种硼酸频哪醇酯(C(sp 2 )–、C(sp 3 )– 和 C(sp)–B 化合物)与 CO 2的 Cu 催化羧化反应,有效地提供了相应的产物,包括芳基、烯基、烷基和炔基羧酸。这种羧化也适用于在稳健的反应条件下产生二元和三元羧酸的多重CO2固定(总共29个实例)。
Tropylium-Promoted Hydroboration Reactions: Mechanistic Insights <i>Via</i> Experimental and Computational Studies
作者:Nhan N. H. Ton、Binh Khanh Mai、Thanh Vinh Nguyen
DOI:10.1021/acs.joc.1c01208
日期:2021.7.2
hydroboration reaction of alkynes. A broad range of vinylboranes can be easily accessed via this metal-free protocol. Similar hydroboration reactions of alkenes and epoxides can also be efficiently catalyzed by the same tropylium catalysts. Experimentalstudies and DFT calculations suggested that the reaction follows an uncommon mechanistic pathway, which is triggered by the hydride abstraction of pinacolborane
AgSbF<sub>6</sub>-Catalyzed <i>anti</i>-Markovnikov hydroboration of terminal alkynes
作者:Ramesh Mamidala、Vipin K. Pandey、Arnab Rit
DOI:10.1039/c8cc07499b
日期:——
AgSbF6-Catalyzed anti-Markovnikov addition of pinacolborane (HBpin) to terminal alkynes to produce the E-vinylboronates is reported. This efficient methodology is scalable, compatible with sterically and electronically diverse alkynes, and works at room temperature under solvent-free condition. The utility of this method is demonstrated in the facilesynthesis of the clinically important (E)-2,4,3′
Stereoselective Hydroboration of Diynes and Triyne to Give Products Containing Multiple Vinylene Bridges: A Versatile Application to Fluorescent Dyes and Light-Emitting Copolymers
作者:Taegweon Lee、Chul Baik、Il Jung、Kyu Ho Song、Sanghoon Kim、Duckhyun Kim、Sang Ook Kang、Jaejung Ko
DOI:10.1021/om049832m
日期:2004.9.1
The Rh(I)-catalyzed hydroboration of a variety of aromatic diynes and a triyne afforded bis(boryl)- and tris(boryl)vinyl products. The hydroboration products under-went Suzuki cross-coupling reactions with a variety of substrates containing chromophore units to give fluorescent dye-substituted products. The hydroboration product also reacted with dibromoarenes to afford an oligomer with a vinylene unit along the oligomer backbone.
Cu-catalyzed carboxylation of organoboronic acid pinacol esters with CO<sub>2</sub>
作者:Chihiro Maeda、Takumi Cho、Ren Kumemoto、Tadashi Ema
DOI:10.1039/d3ob00938f
日期:——
carboxylic acids is of great significance. Among the CO2 fixation methods, multiple carboxylation is one of the challenging subjects. Here we investigated the Cu-catalyzed carboxylation of a variety of boronic acidpinacolesters (C(sp2)–, C(sp3)–, and C(sp)–B compounds) with CO2, which efficiently provided the corresponding products, including aryl, alkenyl, alkyl, and alkynyl carboxylic acids. This carboxylation
CO 2的化学固定受到了广泛的关注。特别是与CO 2催化形成C-C键生成羧酸具有重要意义。在CO 2固定方法中,多重羧化是具有挑战性的课题之一。在这里,我们研究了多种硼酸频哪醇酯(C(sp 2 )–、C(sp 3 )– 和 C(sp)–B 化合物)与 CO 2的 Cu 催化羧化反应,有效地提供了相应的产物,包括芳基、烯基、烷基和炔基羧酸。这种羧化也适用于在稳健的反应条件下产生二元和三元羧酸的多重CO2固定(总共29个实例)。
Regio- and chemoselective hydroboration of terminal alkynes with pinacolborane catalyzed by organo rare earth metal complexes
作者:Muhammad Asif Iqbal、Xiangqian Yan、Ruoling Li、Fu Zhijia、Shaowen Zhang、Xiaofang Li
DOI:10.1039/d3nj04957d
日期:——
chemoselective hydroboration of terminal alkynes with pinacolborane by a series of constrained-geometry catalyst-type or CGC-type rareearthmetal monoalkyl complexes. This protocol offers a 100% atom-efficient and straightforward route for the synthesis of a variety of (E)-1-alkenylborons with the advantages such as high yield, high E-selectivity up to >99.9%, multiple metal center, broad substrate scope
我们在此报道了通过一系列受限几何催化剂型或CGC型稀土金属单烷基配合物对末端炔烃与频那醇硼烷进行区域和化学选择性硼氢化反应。该方案为合成各种( E )-1-烯基硼提供了100%原子效率且简单的路线,具有产率高、E选择性高达>99.9%、多金属中心、底物广泛等优点适用范围、广泛的官能团耐受性,并且不需要溶剂。( E )-1-烯基硼的克级合成和随后转化为几种功能化合物表明了这种合成方法的实际应用。通过ESI-MS、同位素标记实验和原位 1 H NMR 光谱探索了反应机理。