One-Pot Double Intramolecular Cyclization Approach to Tetralin-Based Cis-Fused Tetracyclic Compounds
作者:Arup Jyoti Das、Sajal Kumar Das
DOI:10.1021/acs.joc.1c02963
日期:2022.4.15
Presented herein is a BF3·OEt2-mediated, diastereoselective one-pot double cyclization of 4-aryl-2-[(arylthio)methyl]butanals leading to the formation of cis-tetrahydro-6H-naphtho[2,1-c]thiochromenes for the first time. Mechanistically, the formation of the title products involves the one-pot intramolecular Friedel–Crafts hydroxyalkylation/intramolecular Friedel–Crafts alkylation cascade. This synthetic
本文介绍了 BF 3 ·OEt 2介导的非对映选择性一锅双环化 4-芳基-2-[(芳硫基)甲基]丁醛,导致形成cis -tetrahydro-6 H -naphtho[2,1- c ]硫色素第一次。从机理上讲,标题产物的形成涉及一锅法分子内 Friedel-Crafts 羟烷基化/分子内 Friedel-Crafts 烷基化级联反应。该合成方法具有原子经济性高、底物范围广、无过渡金属反应条件温和、一锅组装两个新环的能力以及中等至高产率(高达 94% 产率)的特点。然后将其用于合成巴西兰的硫杂类似物和色烯[3,4-c ]色烯衍生物。此外,该方法成功地扩展到了顺式六氢苯并[ c ]菲的合成。具体而言,首先对 1,5-二芳基戊烷-3-酮进行 Corey-Chaykovsky 反应,所得环氧化物未经色谱分离,用 BF 3 ·OEt 2处理,以高产率(高达两步收率 84%)。