Nickel-Catalyzed Homo- and Cross-Coupling of Allyl Alcohols via Allyl Boronates
作者:Yi Gan、Hui Hu、Yuanhong Liu
DOI:10.1021/acs.orglett.0c01424
日期:2020.6.5
allylic alcohols to 1,5-dienes in the presence of B2pin2 with excellent regioselectivity has been developed. Mechanistic studies indicate that the reaction proceeds via sequential nickel-catalyzed borylation of allylalcohols followed by cross-coupling of the resulting allyl boronates with allylalcohols. The method was effectively applied to nickel-catalyzed allylation of aldehydes using allylic alcohols
Catalytic Photoredox Allylation of Aldehydes Promoted by a Cobalt Complex
作者:Andrea Gualandi、Giacomo Rodeghiero、Rossana Perciaccante、Thomas Paul Jansen、Cristina Moreno‐Cabrerizo、Charles Foucher、Marianna Marchini、Paola Ceroni、Pier Giorgio Cozzi
DOI:10.1002/adsc.202001250
日期:2021.2.16
The preparation of homoallylic alcohols by addition of organometallic allyl compounds to carbonyls is an important strategy in organic chemistry. Allylating organometallic cobalt species can be generated employing stoichiometric quantities of Zn acting as reductant. To avoid the employment of stoichiometric amount of Zn, we have developed an allylation reaction of aromatic and aliphatic aldehydes promoted
Allylation of aldehydes by dual photoredox and nickel catalysis
作者:Andrea Gualandi、Giacomo Rodeghiero、Adriana Faraone、Filippo Patuzzo、Marianna Marchini、Francesco Calogero、Rossana Perciaccante、Thomas Paul Jansen、Paola Ceroni、Pier Giorgio Cozzi
DOI:10.1039/c9cc03344k
日期:——
Here we report the application of dualnickel/photoredox catalysis to the allylation of aliphatic, aromatic and heteroaromatic aldehydes by using commercially available reagents. The process utilizes the combination of a Ni(II) complex, [Ru(bpy)3]2+ as a photoredox catalyst, and allylacetate under blue LED irradiation, and allows the synthesis of a large variety of homoallylic alcohols.
Catalytic Nucleophilic Allylation Driven by the Water–Gas Shift Reaction
作者:Scott E. Denmark、Zachery D. Matesich、Son T. Nguyen、Selena Milicevic Sephton
DOI:10.1021/acs.joc.7b02658
日期:2018.1.5
of this reactionfrom the initial serendipitous discovery to its general synthetic scope is detailed, highlighting the roles of water, CO, and amine in the generation of a more complete catalytic cycle. The use of unsymmetrical allylic pro-nucleophiles was shown to give preferential product formation through the modulation of reaction conditions. Both (E)-cinnamyl acetate and vinyl oxirane were efficiently
钌与烯丙基亲核试剂的醛催化烯丙基化已被证明是在温和条件下形成碳-碳键的有效方法。此反应从最初的偶然发现到其一般合成范围的演变过程都进行了详细介绍,突出了水,一氧化碳和胺在更完整的催化循环生成中的作用。结果表明,使用不对称的烯丙基亲核亲核试剂可以通过调节反应条件来优先形成产物。(E)-肉桂酸乙酸酯和乙烯基环氧乙烷均有效地用于形成抗支链产物(抗/ syn最高> 20:1 )和E-线性产物(最高> 20:1 E / s )Z)分别与芳香族,α,β-不饱和和脂肪族醛形成高选择性。强调了使反应对映选择性的尝试,包括对苯甲醛高达75:25的对映富集。
Synthesis and Application of Chiral Spiro Phospholane Ligand in Pd-Catalyzed Asymmetric Allylation of Aldehydes with Allylic Alcohols
monodentate spiro phenylphospholane ligand 4 was prepared from a readily accessible, enantiomerically pure 1,1'-spirobiindane-7,7'-diol in high yield. This ligand has proven to be efficient for Pd-catalyzed enantioselective allylation of aldehydes with allylicalcohols. Aromatic, heteroaromatic, and aliphatic aldehydes gave homoallylic alcohols in good enantioselectivities (up to 83% ee) and excellent