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.