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Convergent Enantioselective Route to Structurally Diverse 6-Deoxytetracycline Antibiotics
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Convergent Enantioselective Route to Structurally Diverse 6-Deoxytetracycline Antibiotics
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Journal Article
Convergent Enantioselective Route to Structurally Diverse 6-Deoxytetracycline Antibiotics
2005
Overview
Complex antibiotics based on natural products are almost invariably prepared by semisynthesis, or chemical transformation of the isolated natural products. This approach greatly limits the range of accessible structures that might be studied as new antibiotic candidates. Here we report a short and enantioselective synthetic route to a diverse range of 6-deoxytetracycline antibiotics. The common feature of this class is a scaffold of four linearly fused rings, labeled A through D. We targeted not a single compound but a group of structures with the D ring as a site of structural variability. A late-stage, diastereoselective C-ring construction was used to couple structurally varied D-ring precursors with an AB precursor containing much of the essential functionality for binding to the bacterial ribosome. Five derivatives were synthesized from benzoic acid in yields ranging from 5 to 7% over 14 to 15 steps, and a sixth, (-)-doxycycline, was synthesized in 8.3% yield over 18 steps.
Publisher
American Association for the Advancement of Science,The American Association for the Advancement of Science
Subject
/ Anions
/ Anti-Bacterial Agents - chemical synthesis
/ Anti-Bacterial Agents - chemistry
/ Anti-Bacterial Agents - pharmacology
/ Antibiotics. Antiinfectious agents. Antiparasitic agents
/ Biological and medical sciences
/ Esters
/ Gram-Negative Bacteria - drug effects
/ Gram-Positive Bacteria - drug effects
/ Pharmacology. Drug treatments
/ Q1
/ Tetracyclines - chemical synthesis
