Pd(II)-Catalyzed One-Step Construction of Cycloalkane-Fused Indoles and Its Application in Formal Synthesis of (±)-Aspidospermidine
摘要:
A highly efficient, redox-free Pd(II)-catalyzed tandem cyclization reaction initiated by intramolecular amino-palladation of alkynes followed by nucleophilic addition to nitrites is developed. This method provides a versatile approach for the synthesis of six- to eight-membered ring-fused indoles in one step and has also shown advantages in the formal synthesis of (+/-)-aspidospermidine.
Atom-Economic Synthesis of Pentaleno[2,1-<i>b</i>]indoles via Tandem Cyclization of Alkynones Initiated by Aminopalladation
作者:Junjie Chen、Xiuling Han、Xiyan Lu
DOI:10.1021/acs.joc.6b02817
日期:2017.2.17
An atom-economic Pd(OAc)2-catalyzed tandem cyclization of alkynones to synthesize pentaleno[2,1-b]indoles was developed efficiently. In the formed tetracyclic indole framework, two neighboring stereocenters, one being all-carbon quaternary, are being constructed in a single process with excellent diastereoselectivity. This reaction was initiated by aminopalladation of alkynes and quenched by addition
有效地开发了原子经济的Pd(OAc)2催化的炔烃串联环化反应,合成了戊烯二酚[2,1- b ]吲哚。在所形成的四环吲哚骨架中,两个相邻的立体中心(一个为全碳季铵盐)以单一非对映选择性的方法进行构建。该反应通过炔的氨基palpalpalation开始,并通过加至分子内羰基中止。