Total Synthesis of (±)-Brazilin Using [4 + 1] Palladium-Catalyzed Carbenylative Annulation
作者:Vanessa Arredondo、Daniel E. Roa、Eugene S. Gutman、Nancy O. Huynh、David L. Van Vranken
DOI:10.1021/acs.joc.9b02343
日期:2019.11.15
in a formal synthesis of (±)-picropodophyllone and a total synthesis of (±)-brazilin. All prior syntheses of brazilin have involved a Friedel-Crafts alkylation in the key carbon-carbon bond forming events. The palladium-catalyzed [4 + 1] reaction generates a 1-arylindane with all of the functionalities needed for formation of the indano[2,1-c]chroman ring system of brazilin. The synthesis of (±)-brazilin
钯催化的卡宾插入用于(±)-鬼臼苦素的正式合成和(±)-巴西灵的全合成中。巴西林以前的所有合成方法都在关键的碳-碳键形成过程中涉及了Friedel-Crafts烷基化反应。钯催化的[4 +1]反应生成1-芳基茚满,其具有形成巴西林的茚并[2,1-c] chroman环系统所需的所有功能。(±)-brazilin的合成以11个步骤(最长的线性序列)完成,总产率为11%。