Synergistic Relay Reactions To Achieve Redox‐Neutral α‐Alkylations of Olefinic Alcohols with Ruthenium(II) Catalysis
作者:Chen‐Chen Li、Jian Kan、Zihang Qiu、Jianbin Li、Leiyang Lv、Chao‐Jun Li
DOI:10.1002/anie.201915218
日期:2020.3.9
the first Grignard-type nucleophilic addition using olefinicalcohols as latent carbonyl groups, providing a higher yield of the corresponding secondary alcohol than the classical hydrazone addition to aldehydes does. A broad scope of unsaturated alcohols and hydrazones, including some complex structures, can be successfully employed in this reaction, which shows the versatility of this approach and
Photocatalytic carbanion generation – benzylation of aliphatic aldehydes to secondary alcohols
作者:Karsten Donabauer、Mitasree Maity、Anna Lucia Berger、Gregory S. Huff、Stefano Crespi、Burkhard König
DOI:10.1039/c9sc01356c
日期:——
present a redox-neutral method for the photocatalytic generation of carbanions. Benzylic carboxylates are photooxidized by single electron transfer; immediate CO2 extrusion and reduction of the in situ formed radical yields a carbanion capable of reacting with aliphatic aldehydes as electrophiles giving the Grignard analogous reaction product.
Enantioselective Alkyl−Alkyl Suzuki Cross-Couplings of Unactivated Homobenzylic Halides
作者:Bunnai Saito、Gregory C. Fu
DOI:10.1021/ja8013677
日期:2008.5.1
effective method for asymmetric cross-couplings of unactivatedalkyl electrophiles has been developed, specifically, a nickel-based catalyst for stereoconvergent Suzuki reactions of homobenzylic bromides with alkylboranes. To the best of our knowledge, there are no previous examples of enantioselective Suzuki couplings of alkyl electrophiles (activated or unactivated). Both of the catalyst components
Nickel-Catalyzed Enantioselective Conjunctive Cross-Coupling of 9-BBN Borates
作者:Matteo Chierchia、Chunyin Law、James P. Morken
DOI:10.1002/anie.201706719
日期:2017.9.18
Catalyticenantioselective conjunctive cross‐coupling between 9‐BBN borate complexes and aryl electrophiles can be accomplished with Ni salts in the presence of a chiral diamine ligand. The reactions furnish chiral 9‐BBN derivatives in an enantioselective fashion and these are converted to chiral alcohols and amines, or engaged in other stereospecific C−C bond forming reactions.
Reagent-Controlled Asymmetric Homologation of Boronic Esters by Enantioenriched Main-Group Chiral Carbenoids
作者:Paul R. Blakemore、Stephen P. Marsden、Huw D. Vater
DOI:10.1021/ol053055k
日期:2006.2.1
and (S)-1-chloro-2-phenylethyllithium (26), generated in situ by sulfoxide ligand exchange from (-)-(R(S),R)-1-chloro-2-phenylethyl p-tolyl sulfoxide (8), effected the stereocontrolled homologation of boronicesters. sec-Alcohols derived from the product boronates by oxidation with basic hydrogen peroxide exhibited % ee closely approaching that of sulfoxide 8 in examples employing Li-carbenoid 26.