Catalytic Enantioselective Synthesis of α,β-Diamino Acid Derivatives
作者:Le Li、Madhu Ganesh、Daniel Seidel
DOI:10.1021/ja9034494
日期:2009.8.26
Highly enantio- and diastereoselective organocatalytic Mannich additions of alpha-isothiocyanato imides to sulfonyl imines are reported. Enantiomerically enriched syn-alpha,beta-diamino acidderivatives can be obtained in excellent yields using catalyst loadings as low as 0.25 mol %.
A Novel Method for the Synthesis of <i>N</i>-Sulfonylaldimines by ZnO as a Recyclable Neutral Catalyst Under Solvent-Free Conditions
作者:Mona Hosseini-Sarvari、Hashem Sharghi
DOI:10.1080/10426500701372355
日期:2007.7.19
ZnO acts as an effective catalyst for the rapid synthesis of a range of N-sulfonylaldimines from aromatic aldehydes and sulfonamides under solvent free conditions. The ZnO powder can be reused up to three times after simple washing with distilled water and ethyl acetate.