Tf2O-catalyzed Friedel–Crafts alkylation to synthesize dibenzo[a,d]cycloheptene cores and application in the total synthesis of Diptoindonesin D, Pauciflorial F, and (±)-Ampelopsin B
作者:Gang-Wei Wang、Hong-Li Wang、David A. Capretto、Qi Han、Rong-Bin Hu、Shang-Dong Yang
DOI:10.1016/j.tet.2012.03.073
日期:2012.7
By using Tf2O as a catalyst, we have developed a protocol for the preparation of various dibenzo[a,d]cycloheptene cores via Friedel–Crafts alkylation. Using this method as the key step, we also present concise and useful routes to synthesize the natural products Diptoindonesin D, Pauciflorial F, and (±)-Ampelopsin B. Notably, this process exhibited following very attractive features: (i) the process
通过使用Tf 2 O作为催化剂,我们已经开发了通过Friedel-Crafts烷基化反应制备各种二苯并[ a,d ]环庚烯核的方案。使用此方法作为关键步骤,我们还提供了简洁实用的途径来合成天然产物Diptoindonesin D,洋紫苏F和(±)-AmpelopsinB。值得注意的是,该过程具有以下非常吸引人的特征:不含金属,仅使用催化量的Tf 2 O,并且(ii)该方法简单且环保,避免使用过量的碱,氧化剂或其他添加剂。