One-Pot Facile Synthesis of Substituted Isoindolinones via an Ugi Four-Component Condensation/Diels−Alder Cycloaddition/ Deselenization−Aromatization Sequence
作者:Xian Huang、Jianfeng Xu
DOI:10.1021/jo901628a
日期:2009.11.20
A versatile one-pot synthesis of substituted isoindolinones from 2-furaldehydes, amines, 2-(phenylselanyl)acrylic acids, and isocyanides is described. The tandem process involves the Ugi four-component condensation, intramolecular Diels−Alder cycloaddition, and subsequent deselenization−aromatization promoted by BF3−OEt2. The procedure is general and efficient and the substrates are easily available
Cyclobutane Synthesis and Fragmentation. A Cascade Route to the <i>Lycopodium</i> Alkaloid (−)-Huperzine A
作者:James D. White、Yang Li、Jungchul Kim、Miroslav Terinek
DOI:10.1021/acs.joc.5b01619
日期:2015.12.4
asymmetric total synthesis of the nootropic alkaloid (−)-huperzine A was completed using a cascade sequence initiated by an intramolecular aza-Prins reaction and terminated by a stereoelectronically guided fragmentation of a cyclobutylcarbinyl cation as the key step in assembling the bicyclo[3.3.1]nonene core of the natural product. Intramolecular [2 + 2]-photocycloaddition of the crotyl ether of (S)-4-h