Transition-metal-catalyzed cross-coupling reactions between naturally abundant sp3-hybridized carbon centers facilitate access to diverse molecules with complex three-dimensional structures. Organometallic compounds are among one of the most powerful reagents that are broadly used in carbon–carbon bondformations. Although sp2-hybridized organometallic compounds are widely employed in cross-couplings, sp3-hybridized
Ligand‐Controlled Regiodivergent Hydroalkylation of Pyrrolines
作者:Deyun Qian、Xile Hu
DOI:10.1002/anie.201912629
日期:2019.12.16
Nickel hydride (NiH) catalyzed hydrocarbonation has emerged as an efficient approach to construct new C-C bonds containing at least one C(sp3 ) center. However, the regioselectivity of this reaction is by far dictated by substrates. Described here is a strategy to achieve two different regioselectivites of hydroalkylation of the same substrates by using ligand control. This strategy enables the first
Nickel-Catalyzed <i>C</i>-Alkylation of Nitroalkanes with Unactivated Alkyl Iodides
作者:Sina Rezazadeh、Vijayarajan Devannah、Donald A. Watson
DOI:10.1021/jacs.7b04312
日期:2017.6.21
Enabled by nickel catalysis, a mild and general catalytic method for C-alkylation of nitroalkanes with unactivatedalkyliodides is described. Compatible with primary, secondary, and tertiary alkyliodides; and tolerant of a wide range of functional groups, this method allows rapid access to diverse nitroalkanes.
An iron-catalyzed cross-coupling between di(hetero)arylmanganese reagents and primary and secondary alkyl halides is reported. No rearrangement of secondary alkyl halides to unbranched products was observed in these C–C bond-forming reactions.
Catalyst-controlled doubly enantioconvergent coupling of racemic alkyl nucleophiles and electrophiles
作者:Haohua Huo、Bradley J. Gorsline、Gregory C. Fu
DOI:10.1126/science.aaz3855
日期:2020.1.31
stereochemistry when beginning with readily available racemic starting materials (racemicproducts). Here, we report a chiral nickel catalyst that couples racemic electrophiles (propargylic halides) with racemic nucleophiles (β-zincated amides) to form carbon-carbon bonds in doubly stereoconvergent processes, affording a single stereoisomer of the product from two stereochemical mixtures of reactants.