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
Diastereo‐ and Enantioselective 1,4‐Difunctionalization of Borylenynes by Catalytic Conjunctive Cross‐Coupling
作者:Chunyin Law、Elton Kativhu、Johnny Wang、James P. Morken
DOI:10.1002/anie.202001580
日期:2020.6.22
Enantioselective conjunctive cross‐coupling of enyne‐derived boronate complexes occurs with 1,4 addition of the electrophile and migrating group across the π system. This reaction pathway furnishes α‐boryl allenes as the reaction product. In the presence of a chiral catalyst, both the central and axial chirality of the product can be controlled during product formation.
Alkyl Group Migration in Ni-Catalyzed Conjunctive Coupling with C(sp<sup>3</sup>) Electrophiles: Reaction Development and Application to Targets of Interest
作者:Seung Moh Koo、Alex J. Vendola、Sarah Noemi Momm、James P. Morken
DOI:10.1021/acs.orglett.9b04453
日期:2020.1.17
cross-coupling reaction is developed that allows the construction of chiral organoboronic esters from alkylboron ate complexes and alkyl iodide electrophiles. The process occurs most efficiently with a Ni/Pybox-comprised catalyst and with an acenapthoquinone-derived boron ligand. Because of the broad functional group tolerance of this reaction, it can be a versatile tool for organicsynthesis. Applications
Enantiomerically Enriched α-Borylzinc Reagents by Nickel-Catalyzed Carbozincation of Vinylboronic Esters
作者:Chenlong Zhang、Weipeng Hu、Gabriel J. Lovinger、Jing Jin、Jingjia Chen、James P. Morken
DOI:10.1021/jacs.1c05274
日期:2021.9.8
In this paper is described a synthesis of enantiomerically enriched, configurationally stable organozinc reagents by catalyticenantioselective carbozincation of a vinylboronic ester. This process furnishes enantiomerically enriched α-borylzinc intermediates that are shown to undergo stereospecific reactions, producing enantioenriched secondary boronic ester products. The properties of the intermediate
Enantioselective Synthesis of Tertiary β‐Boryl Amides by Conjunctive Cross‐Coupling of Alkenyl Boronates and Carbamoyl Chlorides
作者:Christopher A. Wilhelmsen、Xuntong Zhang、Jesse A. Myhill、James P. Morken
DOI:10.1002/anie.202116784
日期:2022.4.4
Versatile tertiary β-boryl amides are prepared by conjunctivecross-coupling of α-substituted alkenyl boron “ate” complexes and carbamoyl chloride electrophiles. This reaction gives morpholine amides, which are easily converted to an array of useful building blocks.