inexpensive and atom‐economical approach to CH bond functionalization, a cationic CoIII complex (see scheme) was used to generate nucleophilic organometallic species in situ without additional activating reagents. Under these conditions, aryl CH bonds underwent efficient addition to polar electrophiles, including α,β‐unsaturated N‐acyl pyrroles as β‐substituted ester and amide surrogates.
Co
<sup>I</sup>
‐Catalyzed Barbier Reactions of Aromatic Halides with Aromatic Aldehydes and Imines
作者:Marc Presset、Jérôme Paul、Ghania Nait Cherif、Nisanthan Ratnam、Nicolas Laloi、Eric Léonel、Corinne Gosmini、Erwan Le Gall
DOI:10.1002/chem.201806239
日期:2019.3.21
The reductive Barbier coupling of aromatic halides and electrophiles has been achieved using a CoBr2/1,10‐phenanthroline catalytic system and over stoichiometric amounts of zinc. The reaction displayed a broad scope of substrates, including (hetero)aryl chlorides as pro‐nucleophiles and aldehydes or imines as electrophiles, leading to diarylmethanols and diarylmethylamines in moderate to excellent
Catalytic Asymmetric Vinylogous Mannich Reaction of <i>N</i>-(2-Thienyl)sulfonylimines
作者:Alvaro Salvador González、Ramón Gómez Arrayás、Marta Rodríguez Rivero、Juan C. Carretero
DOI:10.1021/ol8019082
日期:2008.10.2
Both cyclic and acyclic silyl dienol ethers participate efficiently in the asymmetricvinylogousMannichreaction of N-2-thienylsulfonylimines catalyzed by copper(I) complexes of Fesulphos ligands. This procedure displays wide imine and nucleophile versatility, high enantiocontrol, and complete gamma-regioselectivity in most cases examined. The mild sulfonamide deprotection allows the resulting products
Mg-Catalyzed Enantioselective Benzylic CH Bond Functionalization of Isoindolinones: Addition to Imines
作者:Yudai Suzuki、Motomu Kanai、Shigeki Matsunaga
DOI:10.1002/chem.201200821
日期:2012.6.18
Access to chiral isoindolinones: The Mg‐catalyzed enantioselective benzylic CH bond functionalization of isoindolinones is described. A Bu2Mg/Schiff base catalyst (1:1) promoted the enantioselective addition of N‐Boc‐isoindolinones to aryl, heteroaryl, alkenyl, and alkyl imines, giving 3‐substituted isoindolinones in 84–99 % ee and 50:50–91:9 d.r. (see scheme).