a-Phosphono-(3p-amino or 3a-alkylazetidin-2-one-1-yl)acetic acids and esters thereof are provided via cyclization process comprising the reaction of a β-hydroxy phosphonomethyl acid amide with triphenylphosphine-di-(C1-C3 alkyl)azodicarboxylate in an anhydrous aprotic solvent. The azetidinones obtained are useful intermediates to carbapenems and carbacephems and monocyclic antibacterials, e.g., a-(dial- kylphosphono)-[[3β-[2-(2-aminothiazol-4-yl)-2-(syn)methoxy- iminoacetylamino]azetidin-2-one-1-yl]]acetic acid and pharmaceutically acceptable salts thereof.
Simultaneous synthesis of thioesters and iron–sulfur clusters in water: two universal components of energy metabolism
作者:Sebastian A. Sanden、Ruiqin Yi、Masahiko Hara、Shawn E. McGlynn
DOI:10.1039/d0cc04078a
日期:——
thioesters can be synthesized in an aqueous reaction between thioacetate and thiols. The reaction can be coupled to a second reaction between sulfide and either ferrous or ferric iron, which drives the reaction forward. We furthermore demonstrate that sulfide released during thioester formation can be used in the synthesis of peptide bound [Fe–S] clusters, which like thioesters, are ancient components