Total Synthesis of Malacidin A by β-Hydroxyaspartic Acid Ligation-Mediated Cyclization and Absolute Structure Establishment

Zhenquan Sun, Zhuo Shang, Nicholas Forelli, Kathy Hiu Laam Po, Sheng Chen, Sean F Brady, Xuechen Li

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Abstract

The development of novel antibiotics is critical to combating the growing emergence of drug-resistant pathogens. Malacidin A is a new member of the calcium-dependent antibiotic (CDAs) family with activity against antibiotic-resistant pathogens. Its mode of action is distinct from classical CDAs. However, the absolute structure of malacidin A has not been established. Herein, the total syntheses of malacidin A and its analogues are reported by a combination of Fmoc-based solid-phase peptide synthesis (SPPS) and β-hydroxyaspartic acid ligation-mediated peptide cyclization. The total synthesis enabled us to establish the absolute configuration of malacidin A, which is in agreement with those for natural malacidin A confirmed by advanced Marfey's analysis in our study.

Original languageEnglish
JournalAngewandte Chemie - International Edition
DOIs
Publication statusE-pub ahead of print - 29 Jul 2020
Externally publishedYes

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