A Unified Strategy Targeting the Thiodiketopiperazine Mycotoxins Exserohilone, Gliotoxin, the Epicoccins, the Epicorazines, Rostratin A and Aranotin
作者:Ulrike Gross、Martin Nieger、Stefan Bräse
DOI:10.1002/chem.201001169
日期:——
A unified synthetic strategy directed towards mycotoxins belonging to the thiodiketopiperazine family is reported. The building blocks for a number of natural products—including exserohilone, gliotoxin, the epicoccins, the epicorazines, rostratin A and aranotin—have been synthesised stereoselectively from a common precursor. This key intermediate was constructed through an efficient and highly diastereoselective
A short, convergent, and asymmetric synthesis of the epicoccin core was achieved using a phosphite-promoted one-step condensation of a complex proline-type amino acid. Key features of the assembly of this amino acid were a double-bond isomerization/vinylation/ring-closing metathesis strategy as well as an efficient, highly diastereoselective [2 + 2] cycloaddition of a ketene to an enecarbamate, derived from L-pyroglutamic acid.