promising antibiotic and antitumor properties, was obtained from pyrroloindoline anti-cis-1. This result led to a revision of the proposed stereostructure. The new stereostructure was confirmed by the totalsynthesis, which involves stereoselective access to the pyrroloindoline syn-cis-1 and the 5-hydroxypiperazic acid subunit and features a Stille coupling for the formation of the central carbon-carbon bond
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