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.
Efficient one-pot synthesis of 2-azetidinones from acetic acid derivatives and imines using methoxymethylene-N,N-dimethyliminium salt
作者:Aliasghar Jarrahpour、Maaroof Zarei
DOI:10.1016/j.tet.2010.05.009
日期:2010.7
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.
An efficient synthesis and biological testing of novel 3-chloro-4-aryl-1-(4-(phenyldiazenyl)phenyl)azetidin-2-ones
作者:Himani N. Chopde、Ramakanth Pagadala、Jyotsna S. Meshram、Venkateshwarlu Jetti
DOI:10.1002/jhet.459
日期:2010.11
N‐Benzylidene‐4‐(phenyldiazenyl)aniline (Ia, Ib, Ic, Id, Ie, If, Ig, Ih, Ii, Ij) has been prepared from p‐aminoazobenzene with different aromatic aldehydes under microwave irradiation, which on further treatment with chloro acetic acid and POCl3 in the presence of triethyl amine gave the title compounds. The structure of the compounds has been confirmed by spectroscopic techniques (IR and 1H NMR) and
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)。