Development of Enantiospecific Coupling of Secondary and Tertiary Boronic Esters with Aromatic Compounds
作者:Marcin Odachowski、Amadeu Bonet、Stephanie Essafi、Philip Conti-Ramsden、Jeremy N. Harvey、Daniele Leonori、Varinder K. Aggarwal
DOI:10.1021/jacs.6b03963
日期:2016.8.3
functional groups (esters, azides, nitriles, alcohols, and ethers). The reaction also worked well with other electron-rich heteroaromatics and 6-membered ring aromatics provided they had donor groups in the meta position. Conditions were also found under which the B(pin)- moiety could be retained in the product, ortho to the boron substituent. This protocol, which created a new C(sp2)–C(sp3) and an adjacent
Accessing Both Retention and Inversion Pathways in Stereospecific, Nickel-Catalyzed Miyaura Borylations of Allylic Pivalates
作者:Qi Zhou、Harathi D. Srinivas、Songnan Zhang、Mary P. Watson
DOI:10.1021/jacs.6b07396
日期:2016.9.14
enable access to eitherenantiomer of allylboronate product from a single enantiomer of readily prepared allylic pivalate substrate. Excellent functional group tolerance, yields, regioselectivities, and stereochemical fidelities are observed. The stereochemical switch from stereoretention to stereoinversion largely depends upon solvent and can be explained by competitive pathways for the oxidative
Copper-Catalyzed Enantioselective Markovnikov Protoboration of α-Olefins Enabled by a Buttressed N-Heterocyclic Carbene Ligand
作者:Yuan Cai、Xin-Tuo Yang、Shuo-Qing Zhang、Feng Li、Yu-Qing Li、Lin-Xin Ruan、Xin Hong、Shi-Liang Shi
DOI:10.1002/anie.201711229
日期:2018.1.26
Reported is a highly enantioselective copper‐catalyzed Markovnikov protoboration of unactivatedterminalalkenes. A variety of simple and abundant feedstock α‐olefins bearing a diverse array of functional groups and heterocyclic substituents can be used as substrates, and the reaction proceeds under mild reaction conditions at ambient temperature to provide expedient access to enantioenriched alkylboronic
A Theoretically-Guided Optimization of a New Family of Modular P,S-Ligands for Iridium-Catalyzed Hydrogenation of Minimally Functionalized Olefins
作者:Jèssica Margalef、Xisco Caldentey、Erik A. Karlsson、Mercè Coll、Javier Mazuela、Oscar Pàmies、Montserrat Diéguez、Miquel A. Pericàs
DOI:10.1002/chem.201402978
日期:2014.9.15
thioether‐phosphite/phosphiniteligands has been evaluated in the asymmetric iridium‐catalyzedhydrogenation of minimallyfunctionalizedolefins. The modular ligand design has been shown to be crucial in finding highly selective catalysts for each substrate. A DFT study of the transition state responsible for the enantiocontrol in the Ir‐catalyzedhydrogenation is also described and used for further optimization
Synthesis of Secondary and Tertiary Alkyl Boronic Esters by <i>gem</i>
-Carboborylation: Carbonyl Compounds as Bis(electrophile) Equivalents
作者:Dunfa Shi、Lu Wang、Chungu Xia、Chao Liu
DOI:10.1002/anie.201804684
日期:2018.8.6
tertiary alkyl boronic esters. The addition of B2pin2 to a carbonyl compound generates α‐oxyl‐substituted alkyl boron species. Organolithium and Grignard reagents are then applied as C nucleophiles for the 1,2‐metalate rearrangement process. The organolithium reagents can also be generated by C−H lithiation or halogen/lithium exchange. The use of chiral ligands led to the generation of chiral alkyl boronic