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Structure of PeptidoglycanPeptidoglycan is a vital structural component of the bacterial cell wall, providing mechanical strength and shape to the cell. It consists of repeating units of two sugars—N-acetylglucosamine (NAG) and N-acetylmuramic acid (NAM)—linked by β-1,4 glycosidic bonds. These sugar chains are cross-linked by short peptide chains, forming a mesh-like polymer that surrounds the bacterial plasma membrane.Cytoplasmic Phase – Precursor SynthesisPeptidoglycan...
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During replication, the complementary strands in double-stranded DNA are synthesized at different rates. Replication first begins on the leading strand. Replication starts later, occurs more slowly, and proceeds discontinuously on the lagging strand.
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Updated: Jan 25, 2026

Gold Nanoparticle Synthesis
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Synthesis of phantasmidine.

Quan Zhou1, Barry B Snider

  • 1Department of Chemistry MS 015, Brandeis University, Waltham, Massachusetts 02454-9110, USA.

Organic Letters
|December 24, 2010
PubMed
Summary

Researchers synthesized phantasmidine through a novel multi-step process. This involved a keto amide intermediate, followed by a tandem intramolecular aldol reaction and nucleophilic aromatic substitution, yielding a tetracyclic lactam before final reduction.

Area of Science:

  • Organic Synthesis
  • Medicinal Chemistry
  • Heterocyclic Chemistry

Background:

  • The synthesis of complex heterocyclic compounds is crucial for drug discovery.
  • Developing efficient synthetic routes for novel molecular architectures remains a key challenge.

Purpose of the Study:

  • To develop a novel synthetic pathway towards the tetracyclic compound phantasmidine.
  • To explore a tandem reaction sequence involving intramolecular aldol and nucleophilic aromatic substitution.

Main Methods:

  • The synthesis commenced with the reaction of 6-chloro-2-fluoro-3-pyridineacetamide and 1,2-bis(trimethylsilyloxy)cyclobutene.
  • A key step involved treating the intermediate keto amide with aqueous potassium hydroxide (KOH) in tert-butanol (t-BuOH).
  • The final product, phantasmidine, was obtained by reducing the tetracyclic lactam using borane (BH(3)) in tetrahydrofuran (THF).

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Main Results:

  • The initial reaction yielded a keto amide intermediate in 85% yield.
  • The tandem intramolecular aldol reaction-intramolecular nucleophilic aromatic substitution sequence afforded the tetracyclic lactam in 46% yield.
  • Phantasmidine was successfully synthesized in 67% yield via reduction of the lactam.

Conclusions:

  • A viable synthetic route to phantasmidine has been established.
  • The study highlights the utility of tandem reaction sequences in constructing complex heterocyclic systems.
  • This methodology provides a foundation for further exploration of related chemical structures.