The synthesis of 7,9-dimethoxy-3-propyl-3,4-dihydro-1H-benzo[g]isochromene-1,5,10-trione: A potential monomer for the synthesis of the natural product xylindein
作者:Md. Firoj Hossain、Andreas Lemmerer、Charles B. de Koning
DOI:10.24820/ark.5550190.p011.313
日期:——
A novel synthesis of a 3-propyl-substituted-benzo[g]isochromene quinone, a potential monomer of the natural product xylindein, was accomplished in 9 steps (overall yield of 8.2%) from 2,4dimethoxybenzaldehyde. Key steps included the use of a cross-metathesis reaction in which ethyl-3-allyl-4(benzyloxy)-1,6,8-trimethoxy-2-naphthoate was converted into ethyl-4-(benzyloxy)-1,6,8-trimethoxy-3-(4oxopen
3-丙基取代的苯并[g]异色烯醌是天然产物木茚的潜在单体,它的新合成是从 2,4-二甲氧基苯甲醛分 9 个步骤完成的(总产率为 8.2%)。关键步骤包括使用交叉复分解反应,其中乙基-3-烯丙基-4(苄氧基)-1,6,8-三甲氧基-2-萘甲酸酯被转化为乙基-4-(苄氧基)-1,6, 8-三甲氧基-3-(4oxopent-2-enyl)-2-naphthoate (E) 和 (Z)-异构体的混合物。在氧杂-迈克尔加成反应后,所需产物的外消旋混合物 5-(苄氧基)-7,9,10-三甲氧基-3-(2-氧代丙基)-3,4dihydro-1H-benzo[g]isochromen-获得了 1-one,基本的 xylindein 内酯骨架。