The inducamides are a family of chlorinated alkaloids featuring an amide arising from union of an L-tryptophan to a rare chlorosalicylic acid unit, the production of which is linked to a chemically induced mutation in the RNA polymerase of Streptomyces sp. (SNC-109-M3). The synthesis of inducamides A and B has been accomplished by the coupling of 6-hydroxy-3-chloro-2-methylbenzoic acid with L-6-chlorotryptophan and L-tryptophan, respectively, followed by ester hydrolysis. The spectroscopic data and optical rotation for each synthetic sample confirm the structures of these silent secondary metabolites and their biosynthesis from L-tryptophan.
Total Synthesis of NW-G01, a Cyclic Hexapeptide Antibiotic, and 34-epi-NW-G01
摘要:
NW-G01, a cyclic hezapeptide antibiotic, and 34-epi-NW-G01 were synthesized by the highly stereoselective convergent approach for the first time, thereby unambiguously determining the absolute structure of NW-G01.
Total Synthesis of Chloptosin: A Dimeric Cyclohexapeptide
作者:Alexander J. Oelke、Francesca Antonietti、Leonardo Bertone、Philippa B. Cranwell、David J. France、Rebecca J. M. Goss、Tatjana Hofmann、Stephan Knauer、Steven J. Moss、Paul C. Skelton、Richard M. Turner、Georg Wuitschik、Steven V. Ley
DOI:10.1002/chem.201003216
日期:2011.4.4
Here we describe in full our investigations into the synthesis of the dimeric cyclohexapeptide chloptosin in 17 linear steps. Particularly, this work features an organocatalytic tandem process for the synthesis of the embedded piperazic acids, in which a differentially protected azodicarboxylate is used together with pyrrolidinyl tetrazole as the catalyst. The central biaryl bond is being formed by
作者:Alexander J. Oelke、David J. France、Tatjana Hofmann、Georg Wuitschik、Steven V. Ley
DOI:10.1002/anie.201002880
日期:2010.8.16
one: A new organocatalytic route for the asymmetric preparation of the embedded piperazic acids and a Stille coupling of an ortho‐chloropyrroloindole served as key steps in the totalsynthesis of the dimeric cyclopeptide chloptosin (see structure).