Carbonyl transposition on organoselenium compounds
作者:João V. Comasseto、Wai L. Lo、Nicola Petragnani
DOI:10.1016/s0040-4020(97)00454-7
日期:1997.6
Carbonyl conjugated vinylic selenides undergo 1,3 and 1,5-carbonyl transposition sequences through organometallic reagents addition reactions followed by acid hydrolysis.
Asymmetric multifunctional organocatalytic Michael addition of nitroalkanes to α,β-unsaturated ketones
作者:Pengfei Li、Yongcan Wang、Xinmiao Liang、Jinxing Ye
DOI:10.1039/b804540b
日期:——
Cinchona alkaloid derived primary amine thioureas organocatalyzed Michael addition of nitroalkanes to enones in good yield and up to 98% ee and offered a new way to construct quaternary stereocenters from enones and nitroalkanes.
Enantioselective organocatalytic phospha-Michael reaction of α,β-unsaturated ketones
作者:Shigang Wen、Pengfei Li、Haibo Wu、Feng Yu、Xinmiao Liang、Jinxing Ye
DOI:10.1039/c0cc00094a
日期:——
Enantioselective organocatalytic phospha-Michael reaction of alpha,beta-unsaturated ketones and diaryl phosphine oxides has been developed for the first time employing multifunctional organocatalysts. Optically active products bearing quaternary chiral carbon stereocenters were obtained in high yields with good to excellent enantioselectivities (up to 98% ee).
A General, Scalable, Organocatalytic Nitro-Michael Addition to Enones: Enantioselective Access to All-Carbon Quaternary Stereocenters
作者:Xiaodong Gu、Yuanyuan Dai、Tingting Guo、Allegra Franchino、Darren J. Dixon、Jinxing Ye
DOI:10.1021/acs.orglett.5b00387
日期:2015.3.20
Michael addition of nitromethane to five-, six-, and seven-membered β-substituted cyclic enones with excellent enantioselectivity, offering scalable, asymmetric access to all-carbon quaternary stereocenters. The reaction scope can be expanded to include linear acyclic enones, and excellent levels of enantioselectivity are also observed. Furthermore, this organocatalytic, asymmetric nitro-Michael reaction
Two methods for the preparation of 2-cyclohexenones from resin-bound 1,3-cyclohexanedione
作者:Mark E. Fraley、Robert S. Rubino
DOI:10.1016/s0040-4039(97)00631-x
日期:1997.5
The addition of organolithium or Grignard reagents to vinylogous ester resin 1 followed by mild hydrolysis of product resins 2 provides 3-alkyl-2-cyclohexenones in high purity (>95%). Alternatively, conversion of 1 to vinyl triflate resin 4 followed by palladium-mediated couplings with aryl boronic acids and hydrolysis furnishes 3-aryl-2-cyclohexenones in lower yield, but exceptional purity.