Regiodivergent DH or HD Addition to Alkenes: Deuterohydrogenation versus Hydrodeuterogenation
作者:Luomo Li、Gerhard Hilt
DOI:10.1021/acs.orglett.0c00213
日期:2020.2.21
utilizing selectively deuterated dihydroaromatic compounds, which were generated by cobalt catalysis. The reaction was initiated by catalytic amounts of BF3·Et2O by abstracting hydride or deuteride ions from the respective dihydroaromatic reducing agents and led to a highly regioselective incorporation of deuterium and hydrogen at the desired positions of the starting material.
Coupling of Reformatsky Reagents with Aryl Chlorides Enabled by Ylide‐Functionalized Phosphine Ligands
作者:Zhiyong Hu、Xiao‐Jing Wei、Jens Handelmann、Ann‐Katrin Seitz、Ilja Rodstein、Viktoria H. Gessner、Lukas J. Gooßen
DOI:10.1002/anie.202016048
日期:2021.3.15
organozinc reagents with aryl electrophiles using a cyclohexyl‐YPhos ligand bearing an ortho‐tolyl‐substituent in the backbone. This highly electron‐rich, bulky ligand enables the use of arylchlorides in room temperature couplings of Reformatsky reagents. The reaction scope covers diversely functionalized arylacetic and arylpropionic acid derivatives. Aryl bromides and chlorides can be converted selectively
作者:Sheng-Peng Jiang、Xiao-Yang Dong、Qiang-Shuai Gu、Liu Ye、Zhong-Liang Li、Xin-Yuan Liu
DOI:10.1021/jacs.0c09125
日期:2020.11.18
A copper-catalyzed enantioconvergent Suzuki-Miyaura C(sp3)-C(sp2) cross-coupling of various racemic alkyl halides with organoboronate esters has been established in high enantioselectivity. Critical to the success is the use of a chiral cinchona alkaloid-derived N,N,P-ligand for not only enhancing the reducing capability of copper catalyst to favor a stereoablative radical pathway over a stereospecific
Cu-Catalyzed Suzuki–Miyaura reactions of primary and secondary benzyl halides with arylboronates
作者:Yan-Yan Sun、Jun Yi、Xi Lu、Zhen-Qi Zhang、Bin Xiao、Yao Fu
DOI:10.1039/c4cc05376a
日期:——
A copper-catalyzed Suzuki-Miyaura coupling of benzyl halides with arylboronates is described. Varieties of primary benzyl halides as well as more challenging secondary benzyl halides with beta hydrogens or steric hindrance could be successfully converted into the corresponding products. Thus it provides access to diarylmethanes, diarylethanes and triarylmethanes.
Palladium-Catalyzed Cross-Coupling Reaction of Secondary Benzylic Bromides with Grignard Reagents
作者:Ana López-Pérez、Javier Adrio、Juan C. Carretero
DOI:10.1021/ol902335c
日期:2009.12.3
A mild palladium-catalyzed Kumada−Corriu reaction of secondary benzylic bromides with aryl and alkenyl Grignardreagents has been developed. In the presence of the Xantphos ligand, the undesired β-elimination pathway is minimized, affording the corresponding cross-coupling products in acceptable to good yields. The reaction proceeds with inversion of the configuration.