Chiral auxiliaries: A new neutralreaction system with lipophilic [18]crown‐6 derivatives and with an aqueous KCl solution has been successfully utilized for several conjugate‐addition reactions (see scheme). The ring size, lipophilicity of the crown ether, and the presence of water are crucial to promote the reaction efficiently. The reaction system can also be applied to asymmetric conjugate addition
Hydrogen-Bond-Promoted C-C Bond-Forming Reaction: Catalyst-Free Michael Addition Reactions in Ethanol
作者:Seiji Shirakawa、Shoichi Shimizu
DOI:10.1055/s-2007-992377
日期:——
A practical protocol for catalyst-free Michael addition reactions in ethanol was developed. The reaction was promoted efficiently in alcohol without any additives, and the importance of hydrogen-bonding activation was suggested.