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Chiral 1,3-aminosquaramides derived from cis-2-benzamidocyclohexanecarboxylic acid as organocatalysts for asymmetric Michael addition reactions
被引:2
|作者:
Kodama, Koichi
[1
]
Maruyama, Kazuhisa
[1
]
Hirose, Takuji
[1
]
机构:
[1] Saitama Univ, Grad Sch Sci & Engn, Sakura Ku, 255 Shimo Okubo, Saitama 3388570, Japan
来源:
关键词:
Asymmetric synthesis;
Organocatalyst;
Squaramide;
Chirality;
Michael addition;
CATALYZED CONJUGATE ADDITION;
1,3-DICARBONYL COMPOUNDS;
ENANTIOSELECTIVE SYNTHESIS;
SQUARAMIDES;
ALDEHYDES;
D O I:
10.1016/j.tet.2022.132750
中图分类号:
O62 [有机化学];
学科分类号:
070303 ;
081704 ;
摘要:
Herein, chiral 1,3-aminosquaramides derived from cis-2-benzamidocyclohexanecarboxylic acid, which is a chiral beta-amino acid derivative, were synthesized and applied as bifunctional organocatalysts for asymmetric Michael addition reaction of 1,3-dicarbonyl compounds to beta-nitrostyrenes. The catalyst structure and reaction conditions, such as solvent and temperature, were examined, and then, the optimized organocatalyst was successfully applied to the reaction of 1,3-diketones and 1,3-ketoesters with an enantioselectivity of up to 96%. Plausible transition state was proposed based on the results reported in previous reports and DFT calculations.
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页数:6
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