possessing fused seven-membered rings were efficiently synthesized via the Pd-catalyzed intramolecular carbopalladation-annulation of 3-(2-iodobenzyl)-indoles and alkynes. A remarkable base effect on the chemoselectivity of this transformation has been found: switching from Et(3)N to CsOAc completely reverses the reaction path to intramolecular cyclization forming fused five-membered rings.
通过 Pd 催化的 3-(2-
碘苄基)-
吲哚和
炔烃的分子内碳
钯化-环化有效合成了具有稠合七元环的多环
吲哚结构。已经发现对这种转化的
化学选择性的显着基础效应:从 Et(3)N 切换到 CsOAc 完全逆转了分子内环化形成稠合五元环的反应路径。