A Mild and Versatile Method for the Synthesis of Alkyl Ethers from Methoxymethyl Ethers and Application to the Preparation of Sterically Crowded Ethers
A mild and divergent route for the synthesis of alkylethersfrommethoxymethyl (MOM) and methoxyethyl (ME) ether derivatives via pyridinium‐type salt intermediates has been developed. The addition of organocuprates to the salts afforded the corresponding alkylethers, including highly crowded ones, in high yields even in the presence of acid‐ or base‐sensitive functional groups.
Total Synthesis of Laspartomycin C and Characterization of Its Antibacterial Mechanism of Action
作者:Laurens H. J. Kleijn、Sabine F. Oppedijk、Peter ’t Hart、Roel M. van Harten、Leah A. Martin-Visscher、Johan Kemmink、Eefjan Breukink、Nathaniel I. Martin
DOI:10.1021/acs.jmedchem.6b00219
日期:2016.4.14
drug-resistant pathogens. We report the firsttotalsynthesis of laspartomycin C as well as a series of structural variants. Laspartomycin C was found to specifically bind undecaprenyl phosphate (C55-P) and inhibit formation of the bacterial cell wall precursor lipid II. While several clinically used antibiotics target the lipid II pathway, there are no approved drugs that act on its C55-P precursor.
A one-pot reaction of alcohols with trimethylsilyl cyanide and methanesulfonic acid with subsequent neutralization by triethylamine and dehydration by tosyl chloride and pyridine gave the corresponding isocyanides in moderate-to-high yields. This method was used to synthesize tertiary and benzylic isocyanides from the corresponding alcohols. isocyanides -alcohols- Ritter reactions