Iridium-catalyzed enantioselective synthesis of (−)- and (+)-aurantioclavine
摘要:
A new protocol for generating indoleazepine 9 via an Ir-catalyzed intramolecularly asymmetric amination of secondary allylic alcohol 5 in the presence of Carreira ligand (10) and Sc(OTf)(3) is described. This methodology has been exploited in the facile synthesis of natural (-)-aurantioclavine (1), a biosynthetical precursor of communesins, and its unnatural enantiomer (+)-aurantioclavine (ent-1). (C) 2015 Elsevier Ltd. All rights reserved.
Intramolecular Fischer Indole Synthesis for the Direct Synthesis of 3,4-Fused Tricyclic Indole and Application to the Total Synthesis of (−)-Aurantioclavine
作者:Jun Park、Dong-Hyun Kim、Tapas Das、Cheon-Gyu Cho
DOI:10.1021/acs.orglett.6b02541
日期:2016.10.7
meta-position of the aromatic ring undergo acid-promoted intramolecular Fischer indolesynthesis to generate 3,4-fused tricyclic indoles. The preparative utility of this conceptually new synthetic approach, which does not require prefunctionalization of the indole ring, was demonstrated by its application to a concise total synthesis of (−)-aurantioclavine.