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).
Copper(I)-Fesulphos Lewis Acid Catalysts for Enantioselective Mannich-Type Reaction of <i>N</i>-Sulfonyl Imines
作者:Alvaro Salvador González、Ramón Gómez Arrayás、Juan C. Carretero
DOI:10.1021/ol060866v
日期:2006.7.1
[reaction: see text] Copper(I) complexes of Fesulphos ligands are efficient chiral Lewis acid catalysts in the Mannich-type addition of silylenolethers of ketones, esters, and thioesters to N-(2-thienyl)sulfonyl aldimines. The corresponding opticallyactive beta-amino carbonyl derivatives were obtained in good yields (58-91%) and with moderate to good enantioselectivity (61-93% ee). Removal of the N-activating