Efficient one-pot synthesis of 2-azetidinones from acetic acid derivatives and imines using methoxymethylene-N,N-dimethyliminium salt
摘要:
A cheap, versatile and convenient method for synthesis of beta-lactams using methoxymethylene-N,N-dimethyliminium salt as an acid activator in Staudinger reaction is reported. This method is used for the preparation of monocyclic, spirocyclic, N-alkyl and three-electron-withdrawing group beta-lactams. The products are obtained in good to excellent yields. (C) 2010 Elsevier Ltd. All rights reserved.
N-苄叉基-4-(苯基二氮烯基)苯胺(Ia,Ib,Ic,Id,Ie,If,Ig,Ih,Ii,Ij)是在微波辐射下由对氨基苯并与不同的芳族醛制得的,可进一步处理在三乙胺存在下,用氯乙酸和POCl 3洗涤,得到标题化合物。化合物的结构已通过光谱技术证实(IR和11 H NMR)和元素分析。筛选这些氮杂环丁酮类似物对不同微生物菌株的抗微生物活性。一些化合物对某些细菌菌株显示出有希望的抗菌活性。J.杂环化学。(2010)。
Trimellitic anhydride was attached to Merrifield resin and a ketene was generated from polymer-bound phthaloylglycine. Then this polymer reacted with imines in the presence of Vilsmeier reagent and triethylamine to afford the solid-phase-tethered β-lactam products. Selective cleavage of supported β-lactams by trifluoroacetic acid and methylhydrazine gave 4-carboxyphthalimido- and 3-amino-β-lactams, respectively. The trans-stereochemistry was found in all products.