作者:Katharine E. Lambson、Christopher A. Dacko、Jeffrey M. McNeill、Novruz G. Akhmedov、Björn C.G. Söderberg
DOI:10.1016/j.tet.2019.130714
日期:2019.12
Dilemmaones A-C are naturally occurring tricyclic indole alkaloids possessing a unique hydroxymethylene or methoxymethylene substituent at the C2 position of the indole core and a C6–C7 fused cyclopentanone. Dilemmaone B has been prepared in 5 steps from 5-methylindan-1-one, and dilemmaone A has been prepared in 3 steps from a common precursor, 6-bromo-5-methyl-7-nitroindan-1-one. In both syntheses
Dilemmaones AC是天然存在的三环吲哚生物碱,在吲哚核的C2位置具有独特的羟甲基或甲氧基亚甲基取代基,并具有C6-C7稠合的环戊酮。从5甲基茚满-1-酮分5步制备了Dilemmaone B,而从一种常见的前体6-溴-5-甲基-7-nitroindan-1-one分3步制备了DilemmaoneA。在这两个合成中,关键步骤包括Kosugi-Migita-Stille交叉偶联以及使用氢气和过渡金属催化剂的还原环化反应。