Synthesis 2017; 49(02): 391-396
DOI: 10.1055/s-0036-1588355
paper
© Georg Thieme Verlag Stuttgart · New York

Cyclotryptophan Mycotoxins: Short Synthesis of the Desymmetrized meso-Chimonantine Core of Leptosin C

Iurre Olaizola
,
Racha Abed Ali Abdine
,
Hamid Dhimane
,
Peter I. Dalko*
Further Information

Publication History

Received: 14 September 2016

Accepted after revision: 27 October 2016

Publication Date:
01 December 2016 (online)


Dedicated to Professor Dieter Enders on the occasion of his 70th birthday.

Abstract

The desymmetrized meso-chimonantine core of leptosin C was prepared in a short stereoselective convergent sequence in 5 steps as the longest linear path from methyl l-tryptophan hydrochloride as starting material. The key step of this approach was a diastereoselective [4+2] cycloaddition between the bromooxindole and tryptophan derivatives allowing to define the adjacent quaternary benzylic centers in a high chemical yield.

Supporting Information