Acid-mediated aryl migration reaction of C-3 aryl substituted pyrrolidinoindolines
作者:Shinji Tadano、Hayato Ishikawa
DOI:10.1016/j.tetlet.2016.11.069
日期:2017.1
Aryl migration reactions of C-3 aryl substituted pyrrolidinoindoline compounds to provide highly conjugated C-2 aryl indole compounds have been discovered. The developed reactions have a wide substrate scope and proceed in high yield under simple acidic conditions. A unique cationic cyclopropane intermediate as the transition state is proposed.
Bio-Inspired Dimerization Reaction of Tryptophan Derivatives in Aqueous Acidic Media: Three-Step Syntheses of (+)-WIN 64821, (−)-Ditryptophenaline, and (+)-Naseseazine B
作者:Shinji Tadano、Yuri Mukaeda、Hayato Ishikawa
DOI:10.1002/anie.201303143
日期:2013.7.29
Doubling up: The direct bio‐inspired dimerization of commercially available amine‐free tryptophanderivatives in aqueousacidicmedia provides C2‐symmetrical and nonsymmetrical dimeric compounds. Further processing completes the concise syntheses of naturally occurring dimeric diketopiperazine alkaloids such as (+)‐WIN 64821 (see picture) in overall yields of up to 20 %.
diketopiperazine rings. Total yields of these alkaloidsyntheses were from 10 up to 27 %. In addition, 1′‐(2‐phenylethylene)‐ditryptophenaline was synthesized by using three one‐pot operations. The studies detailed herein provided synthesized natural products for inhibitory activities of ubiquitin‐specific protease 7 (USP7) and foam cell formation in macrophages. The newly listed biologicalevaluation for tryptophan‐based