Highly enantioselective Michael addition of acetone to nitroolefins catalyzed by chiral bifunctional primary amine-thiourea catalysts with acetic acid
作者:Qing Gu、Xing-Tao Guo、Xin-Yan Wu
DOI:10.1016/j.tet.2009.04.087
日期:2009.7
Highlyenantioselective Michael reaction of acetone with a variety of nitroolefins catalyzed by N-[(1R,2R)-2-aminocyclohexyl]-N′-(2,3,4,6-tetra-O-acetyl-β-d-glucopyranosyl)-thiourea (1b) together with acetic acid is described. The Michael addition products were obtained in high yields (76–94%) and up to 96% ee.
N -[(1 R,2 R)-2-氨基环己基] -N '-(2,3,4,6-四-O-乙酰基-β- d催化的丙酮与多种硝基烯烃的高度对映选择性迈克尔反应描述了-吡喃葡萄糖基)-硫脲(1b)与乙酸。迈克尔加成产物的收率很高(76-94%),ee最高可达96%。
Noyori's Ts-DPEN Ligand: Simple yet Effective Catalyst for the Highly Enantioselective Michael Addition of Acetone to Nitroalkenes
作者:Lin Peng、Xiao-Ying Xu、Liang-Liang Wang、Jun Huang、Jian-Fei Bai、Qing-Chun Huang、Li-Xin Wang
DOI:10.1002/ejoc.200901509
日期:2010.4
HighlyenantioselectiveMichaeladdition of acetone to a variety of nitroalkenes promoted by simple chiral primary amine bifunctional catalysts (e.g., Noyori's Ts-DPEN ligand) together with terephthalic acid in excellent yields (84-99 %) and enantioselectivities (93―98 % ee) is reported.
A series of new modular bifunctional chiral thiourea organocatalysts were synthesized from natural Cinchona alkaloids and amino acids, and their performance in the aza-Henry reaction of nitroalkanes to imines, the Michaeladdition of acetylacetone to nitroolefins and the Michaeladdition of acetone to nitroolefins was investigated. Under the mild conditions, the important building blocks β-nitro amines
Highly Efficient Amine Organocatalysts Based on Bispidine for the Asymmetric Michael Addition of Ketones to Nitroolefins
作者:Zhigang Yang、Jie Liu、Xiaohua Liu、Zhen Wang、Xiaoming Feng、Zhishan Su、Changwei Hu
DOI:10.1002/adsc.200800341
日期:2008.9.5
highly diastereoselective and enantioselective Michael addition of cyclohexanone, acetone and other ketones to nitroolefins was developed by the use of an amine organocatalyst based on bispidine. Additionally, a theoretical study of transition structures revealed that this bispidine-based primary-secondary amine catalyst could serve through an enamine intermediate and H-bond interaction, which was
Highly enantioselective conjugate addition of nitroalkanes to enones catalyzed by cinchona alkaloid derived primary amine
作者:Wenjing Liu、Desheng Mei、Wei Wang、Wenhu Duan
DOI:10.1016/j.tetlet.2013.05.019
日期:2013.7
A cinchona alkaloid derived primary amine catalyzed conjugate addition of nitroalkanes to enones is described. The process affords the Michael adducts in good yield and with up to 99% ee for both acyclic and cyclic enones.