Asymmetric synthesis of β-amino ketones by using cinchona alkaloid-based chiral phase transfer catalysts
作者:Weihua Li、Yifeng Wang、Danqian Xu
DOI:10.1039/c8ob02484g
日期:——
A highly enantioselective nucleophilic addition of ketones to imines catalyzed by chiral phase-transfer catalysts (N-quaternised cinchona alkaloid ammonium salts) has been developed, and the process affords the Mannich reaction products with tertiary stereocenters in good to high yields (up to 95%) with excellent enantioselectivities (up to 97% ee).
Asymmetric Synthesis of α-Amino Phosphonates by Using Cinchona Alkaloid-Based Chiral Phase Transfer Catalyst
作者:Weihua Li、Yifeng Wang、Danqian Xu
DOI:10.1002/ejoc.201801013
日期:2018.10.24
imines catalyzed by a cinchona alkaloid‐based chiralphase‐transfercatalyst has been developed. The process affords the desired hydrophosphonylation of imine products with quaternary stereocenters in good to high yields (up to 95 % yield) and excellent enantioselectivities (up to 99 % ee). And this straightforward protocol can be applied to gram scale reaction effectively.
Understanding of remarkable corrosion combating action of N-(benzo[d]thiazol-2-yl)-1-(2-substituted phenyl) methanimines: Electrochemical, surface and computational approach
The present study highlights the inspection of corrosion combating potential of four thiazole-derived Schiff bases; N-(6-methoxybenzo[d]thiazol-2-yl)-1-phenylmethanimine (MTPM), 1-(2-chlorophenyl)-N-(6-methoxybenzo[d]thiazol-2-yl) methanimine(CMTM), N-(6-methoxybenzo[d]thiazol-2-yl)-1-(2-methoxyphenyl) methanimine (MTMM) and N-(6-methoxybenzo[d]thiazol-2-yl)-1-(2-nitrophenyl)methanimine (MTNM) againstmild
本研究重点检查了四种噻唑衍生席夫碱的抗腐蚀潜力; N-(6-甲氧基苯并[d]噻唑-2-基)-1-苯基甲亚胺(MTPM)、1-(2-氯苯基)-N-(6-甲氧基苯并[d]噻唑-2-基)甲亚胺(CMTM) 、N-(6-甲氧基苯并[d]噻唑-2-基)-1-(2-甲氧基苯基)甲亚胺 (MTMM) 和 N-(6-甲氧基苯并[d]噻唑-2-基)-1-(2-利用重量分析、电化学和理论研究,在 0.5 M HSO 中对硝基苯基)甲胺 (MTNM) 对抗低碳钢。在 10.50 × 10 M 的理想浓度下,MTMM 的极端抑制效率为 96.3%。研究描述了浓度和取代基对抑制效率的影响。