Total Synthesis of Rhodonoids A, B, E, and F, Enabled by Singlet Oxygen Ene Reactions
作者:Laura Burchill、Jonathan H. George
DOI:10.1021/acs.joc.9b02968
日期:2020.2.21
Singletoxygen is a versatile reagent for the selective oxidation of organic compounds under mild reaction conditions. It is frequently invoked in biosynthetic pathways, so it is especially suitable for application in the biomimetic synthesis of natural products. Herein, we show that use of the singletoxygen ene reaction, combined with [2 + 2] cycloadditions, leads to concise, divergent, and redox-economic
Efficient and general method for the synthesis of benzopyrans by ethylenediamine diacetate-catalyzed reactions of resorcinols with α,β-unsaturated aldehydes. One step synthesis of biologically active (±)-confluentin and (±)-daurichromenic acid
作者:Yong Rok Lee、Jung Hyun Choi、Sang Heum Yoon
DOI:10.1016/j.tetlet.2005.08.159
日期:2005.10
An efficient and general synthesis of benzopyrans is achieved by ethylenediamine diacetate-catalyzed reactions of resorcinols with α,β-unsaturated aldehydes in moderated yields. As an application of this methodology, biologically interesting confluentin, which was known to have an inhibitory effect on histamine release is synthesized in onestep. Also, natural daurichromenic acid, which has highly
Total Syntheses of (±)-Rhodonoids A and B and C12-<i>epi</i>-Rhodonoid B
作者:Hao Wu、Richard P. Hsung、Yu Tang
DOI:10.1021/acs.joc.6b02739
日期:2017.2.3
Totalsyntheses of (±)-rhodonoids A and B and C12-epi-rhodonoid B are described here. A unified strategy employed in these syntheses is an intramolecular oxa-[3 + 3] annulation for accessing the chromene unit. A Fe(OTf)3-promoted diastereoselective cationic [2 + 2] cycloaddition and a photochemical [2 + 2] cycloaddition were featured to construct the cyclobutane core of (±)-rhodonoids A and B and C12-epi-rhodonoid
Efficient and novel one-pot synthesis of polycycles bearing cyclols by FeCl3-promoted [2 + 2] cycloaddition: application to cannabicyclol, cannabicyclovarin, and ranhuadujuanine A
作者:Xin Li、Yong Rok Lee
DOI:10.1039/c3ob42110d
日期:——
Simple and facile synthetic routes for the preparation of biologically interesting cyclol bearing polycycles were developed using FeCl3-promoted [2 + 2] cycloaddition from readily available benzopyrans possessing a variety of substituents. As examples of this methodology, one-step syntheses of cannabicyclol, cannabicyclovarin, and ranhuadujuanine A were accomplished in good yield.
利用 FeCl3 促进的 [2 + 2] 环加成反应,从容易获得的具有多种取代基的苯并吡喃中开发出简单易行的合成路线,用于制备具有生物学意义的环醇多环。作为该方法的例子,大麻二环醇、大麻二环素和ranhuadujuanine A 的一步合成以良好的产率完成。