An environmentally benign, one-pot diazotization and coupling reaction using ChCl:tartaric acid DES at room temperature is described. The bulky tartrate ion renders stability to the diazoniumsalt at room temperature, also evidenced by 1H NMR. The isolated diazoniumsalt is stable and active even after 192 h at room temperature.
描述了在室温下使用ChCl:酒石酸DES进行的环境友好的一锅重氮化和偶联反应。庞大的酒石酸根离子在室温下对重氮盐也具有稳定性,这也由1 H NMR证实。分离出的重氮盐即使在室温下192小时后仍是稳定且有活性的。
The Decomposition Reaction of 4-Acetylsydnones Arylhydrazones
The acidic decomposition of 4-acetylsydnonesarylhydrazones 2 results in the formation of 4-arylhydrazo-1,2-pyrazolin-5-ones 3 and 4-arylamino-1,2,3-triazoles 4, respectively. The reactions of 4-acetylsydnones 1 with arylhydrazines 5 afford compounds 3 as the only products in the absence of solvent.
Chemistry of diazocarbonyl compounds: XXVIII. Reaction of acyclic N-arylsulfonylacetamides with Rh(II)-carbenoids as a new synthetic route to alkyl acetimidoates
作者:A. V. Selivanova、V. V. Nikolaev、R. R. Kostikov、V. A. Nikolaev、J. Siler、B. Schulze
DOI:10.1134/s1070428006120074
日期:2006.12
A new procedure was proposed for the synthesis of alkyl acetimidoates via alkylation of the carbonyl group in N-arylsulfonylacetamides with Rh(II)-carbenoids. The procedure ensures preparation in good yield of acetimidoates having a polyfunctionalized O-alkyl group. The obtained alkyl acetimidoates in crystal exist as E isomers with respect to the C=N bond and as s-cis conformers relative to the C-OCHRR' bond. Alkyl N-arylsulfonylacetimidoates react with ammonia and hydrazine hydrate to give in good yield the corresponding carboximidamides(hydrazides) via replacement of the O-alkyl group. Unlike structurally related compounds having simple alkyl or aryl groups on the nitrogen atom, N-arylsulfonylacetimidoates readily undergo hydrolysis in the presence of moisture and traces of acids.