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.
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).
Three-component reactions based on trapping ammonium ylides with N-sulfonyl aldimines via cooperative catalysis of squaramides and Rh2(OAc)4
作者:Lin Qiu、Dongwei Wang、Fengping Lv、Xin Guo、Wenhao Hu、Liping Yang、Shunying Liu
DOI:10.1016/j.tet.2013.12.082
日期:2014.2
Three-component reactions of aryl diazoacetates, arylamines and N-sulfonyl aldimines cooperatively catalyzed by squaramides and dirhodium acetate are reported to afford N-sulfonyl alpha,beta-diamino acid derivatives in moderate to good yields and diastereoselectivity. Crown Copyright (c) 2014 Published by Elsevier Ltd. All rights reserved.