A revisit of organoaluminumreagents for cross-coupling reactions has opened up several types of C–C bond formation protocols through cleavage of phenolic/alcoholic C–O and C–F and ammonium C–N bonds. Catalyzed by the commercially available NiCl2(PCy3)2 catalyst, these reactions proceed smoothly with a wide range of substrates and broad functional group compatibility, providing a versatile methodology
Silver‐Catalysed Hydroarylation of Highly Substituted Styrenes
作者:Toryn Dalton、Steffen Greßies、Mowpriya Das、Maximilian Niehues、Malte L. Schrader、Christian Gutheil、Bart Jan Ravoo、Frank Glorius
DOI:10.1002/anie.202016268
日期:2021.4.6
Hydroarylation is an effective strategy to rapidly increase the complexity of organic structures by transforming flat alkene moieties into three‐dimensional frameworks. Many strategies have already been developed to achieve the hydroarylation of styrenes, however most of these reports examine the hydroarylation of unpolar, β‐mono‐ or β‐unsubstituted styrenes, while exploring mainly electron‐rich benzene
Catalytic Intermolecular C(sp<sup>3</sup>)–H Amination: Selective Functionalization of Tertiary C–H Bonds vs Activated Benzylic C–H Bonds
作者:Erwan Brunard、Vincent Boquet、Elsa Van Elslande、Tanguy Saget、Philippe Dauban
DOI:10.1021/jacs.1c03872
日期:2021.5.5
A catalytic intermolecular amination of nonactivated tertiary C(sp3)–H bonds (BDE of 96 kcal·mol–1) is reported for substrates displaying an activated benzylic site (BDE of 85 kcal·mol–1). The tertiary C(sp3)–H bond is selectively functionalized to afford α,α,α-trisubstituted amides in high yields. This unusual site-selectivity results from the synergistic combination of Rh2(S-tfpttl)4, a rhodium(II)
<i>gem</i>-Difluorination of Methylenecyclopropanes (MCPs) Featuring a Wagner–Meerwein Rearrangement: Synthesis of 2-Arylsubstituted <i>gem</i>-Difluorocyclobutanes
作者:Peng-Peng Lin、Long-Ling Huang、Si-Xin Feng、Shuang Yang、Honggen Wang、Zhi-Shu Huang、Qingjiang Li
DOI:10.1021/acs.orglett.1c00767
日期:2021.4.16
The protocol proceeds via a Wagner–Meerwein rearrangement with mild reaction conditions, good functional group tolerance, and moderate to good yields. The product could be readily transformed to gem-difluorocyclobutane-containing carboxylic acid, amine, and alcohol, all of which are usefulbuildingblocks for biologically active molecule synthesis.
Rhodium(II)-Catalyzed Enantioselective Intermolecular Aziridination of Alkenes
作者:Vincent Boquet、Ali Nasrallah、Alejandro L. Dana、Erwan Brunard、Pablo H. Di Chenna、Fernando J. Duran、Pascal Retailleau、Benjamin Darses、Marie Sircoglou、Philippe Dauban
DOI:10.1021/jacs.2c07337
日期:2022.9.21
dirhodium(II) tetracarboxylates are highly efficient catalysts for the asymmetric intermolecular aziridination of substituted alkenes with sulfamates. The reaction proceeds with high levels of efficiency and chemoselectivity to afford aziridines with excellent yields of up to 95% and enantiomeric excesses of up to 99%. The scope of the alkene aziridination includes mono-, di-, and trisubstituted olefins as well