Enantioselective Mannich reaction of γ-malonate-substituted α,β-unsaturated esters with N-Boc imines catalyzed by chiral bifunctional thiourea-phosphonium salts
作者:Jiaxing Zhang、Gang Zhao
DOI:10.1016/j.tet.2018.12.052
日期:2019.3
A novel enantioselective Mannichreaction of γ-malonate-substituted α, β-unsaturated esters with N-protected arylaldimines was realized by using asymmetric phase-transfer catalysis (APTC). With amino acid-derived bifunctional thiourea-phosphonium salts as a catalyst, a series of enantio-enriched Mannich products could be synthesized under very mild and simple reaction conditions with high yields and
Tin-Free, Radical-Mediated γ-Alkylations of α,β-Unsaturated Esters via O-<i>tert</i>-Alkyl Dienol Ethers
作者:Sunggak Kim、Jin Lee
DOI:10.1055/s-2007-992385
日期:2008.1
Tin-free, radical-mediated γ-alkylation of α,β-unsaturated esters is accomplished by radical addition and β-fragmentation of O-tert-alkyl dienol ethers and subsequent iodine atom transfer process.