Total syntheses of melinonine-E and strychnoxanthine: Evolution of the synthetic strategy enabled by novel method development
作者:Jisheng Luo、Changmin Xie、Yuping Zhang、Sha-Hua Huang、Lili Zhu、Ran Hong
DOI:10.1016/j.tet.2018.08.015
日期:2018.10
In this full account, the evolution of a syntheticstrategy was detailed from a nitroso-ene cyclization to an aza-Wacker reaction for ring construction in the syntheses of melinonine-E and strychnoxanthine. The aza-Wacker cyclization to form the bridged ring was successfully developed and applied in the first asymmetric syntheses of melinonine-E and strychnoxanthine in 5–6 steps from a readily available
作者:Martyn R. Ashcroft、Peter Bougeard、Adrian Bury、Christopher J. Cooksey、Michael D. Johnson
DOI:10.1016/0022-328x(85)87417-9
日期:1985.7
homolysis of the substrate, abstracts iodine from the toluenesulphonyl iodide to give the toluenesulphonyl radical, which attacks the organic ligand of the cobaloxime, preferably at the terminal olefinic carbon, thereby displacing cobaloxime(II) and giving the observed organic product.
In the work reported herein, the concise and enantioselective total synthesis of the Schizozygine alkaloid (−)-strempeliopine was developed. This synthetic strategy featured the palladium-catalyzed decarboxylative asymmetric allylic alkylation of N-benzoyl lactam to set up the absolute configuration at the C20 position, a highly diastereoselective one-pot Bischler–Napieralski/lactamization and iminium