Synthesis of fused-tricyclic indole derivatives through an acid-promoted skeletal rearrangement
作者:Takuya Yokosaka、Tomoya Kanehira、Hiroki Nakayama、Tetsuhiro Nemoto、Yasumasa Hamada
DOI:10.1016/j.tet.2014.01.074
日期:2014.3
We developed a novel method for synthesizing fused-tricyclic indole derivatives with a 3-aminomethyl indole motif through a reaction cascade involving ipso-Friedel-Crafts alkylation of phenols, rearomatization of the spirocyclohexadienone unit, and iso-Pictet-Spengler reaction. Using TFA as an acid promoter, six-, seven-, and eight-membered ring-fused indoles were obtained in 31-99% yield. (C) 2014 Elsevier Ltd. All rights reserved.