A new approach to access 1-benzylisoindoline and 1-benzyl-tetrahydroisoquinoline has been developed through nucleophilic addition of organozincreagents to N,O-acetals. A number of substituted organozincreagents were amenable for this transformation, and the desired products were obtained with excellent yields. Moreover, Sc(OTf)3 proved to be an effective catalyst for the formation of 1-benzylisoindoline
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).