Organocatalytic diastereoselective [3+2] cyclization of MBH carbonates with dinucleophiles: synthesis of bicyclic imidazoline derivatives that inhibit MDM2–p53 interaction
作者:Hong-Ping Zhu、Ke Xie、Xiang-Hong He、Wei Huang、Rong Zeng、Yang Fan、Cheng Peng、Gu He、Bo Han
DOI:10.1039/c9cc05916d
日期:——
An efficient organocatalyticcyclization strategy was developed to synthesize pharmacologically interesting bicyclic imidazoline derivatives. Morita–Baylis–Hillman carbonates were applied as C3 electrophiles to react with N,C-dinucleophiles for the first time, yielding the desired products in good to excellent yields with outstanding diastereoselectivities. The optically pure bicyclic imidazolines
An asymmetric allylic alkylation reaction of 3-alkylidene oxindoles
作者:Junjun Feng、Xin Li、Jin-Pei Cheng
DOI:10.1039/c5cc06182b
日期:——
An efficient asymmetricallylicalkylation reaction with respect to 3-alkylidene oxindoles and racemic Morita-Baylis-Hillman carbonate has been achieved by using a chiral biscinchona alkaloid catalyst, which delivering the [gamma]-substituted alkylideneoxindoles...
A highly diastereo- and enantioselective asymmetricallylicalkylation reaction with respect to prochiral 3-substituted benzofuran-2(3H)-ones and MBH carbonate by a chiral biscinchona alkaloid catalyst was investigated. The corresponding adducts, containing a quaternary center at the C3-position of the benzofuran-2(3H)-one as well as a vicinal tertiary center, were generally obtained in high yields
Highly enantioselective allylic alkylation of 5 H -oxazol-4-ones with Morita-Baylis-Hillman carbonates
作者:Han Xu、Feng Sha、Xin-Yan Wu
DOI:10.1016/j.tet.2018.06.055
日期:2018.8
An organocatalytic enantioselectiveallylicalkylation of 5H-oxazol-4-ones with Morita-Baylis-Hillman carbonates has been developed. With 10 mol% of commercially available cinchonidine, a wide range of substituted 5H-oxazol-4-one derivatives were constructed in good-to-excellent yields with high diastereo- and enantioselectivities. The allylicalkylation adducts obtained are valuable precursors for
ctones bearing vicinal tertiary and quaternary stereocenters through organocatalyzed asymmetric allylicalkylation is reported. The process demonstrated that weakly stabilized enolates derived from α-aryl-γ-butyrolactones can undergo regio-, diastereo-, and enantioselective allylation using the proper activation of Morita–Baylis–Hillman (MBH) carbonates.