Synthesis of Chiral 1,3-Diamines Derived from cis-2-Benzamidocyclohexanecarboxylic Acid and Their Application in the Cu-Catalyzed Enantioselective Henry Reaction
作者:Koichi Kodama、Kazuyuki Sugawara、Takuji Hirose
DOI:10.1002/chem.201102136
日期:2011.11.25
decrease in product enantioselectivity caused by spontaneous retro‐Henryreaction, which was suppressed by conducting the reaction at 0 °C. This versatile reaction afforded various β‐nitroalcohols in excellent yields and enantioselectivities (up to 98 % yield, 91 % enantiomeric excess) under the optimized reaction conditions. The chiral induction mechanism was explained on the basis of a previously
Chiral 1,3-aminosquaramides derived from cis-2-benzamidocyclohexanecarboxylic acid as organocatalysts for asymmetric Michael addition reactions
作者:Koichi Kodama、Kazuhisa Maruyama、Takuji Hirose
DOI:10.1016/j.tet.2022.132750
日期:2022.4
Herein, chiral 1,3-aminosquaramides derivedfrom cis-2-benzamidocyclohexanecarboxylic acid, which is a chiral β-amino acid derivative, were synthesized and applied as bifunctional organocatalysts for asymmetric Michael addition reaction of 1,3-dicarbonyl compounds to β-nitrostyrenes. The catalyst structure and reaction conditions, such as solvent and temperature, were examined, and then, the optimized