Synthesis of 7-arylimidazo[1,2-a]pyrazin-8(7H)-one derivatives
作者:Svitlana S. Kovalenko、Oleksandr G. Drushlyak、Sergiy M. Kovalenko、Natalya D. Bunyatyan、Dmitry V. Kravchenko、Alexandre V. Ivachtchenko
DOI:10.1007/s10593-019-02469-7
日期:2019.5
A suitable approach to the synthesis of 7-arylimidazo[1,2-a]pyrazin-8(7H)-ones starting from esters of oxalic acid monoamides via cyclization of intermediate 3-aminopyrazin-2-ones with α-halocarbonyl compounds has been suggested.
从草酸单酰胺的酯开始,通过中间体3-氨基吡嗪-2-酮与α-卤代羰基化合物的环化反应,合成7-芳基咪唑并[1,2- a ]吡嗪-8(7 H)-one的合适方法有:被建议。
Synthesis of amino acid derived imidazolidinium salts as new NHC precatalysts
作者:Ragnhild B. Strand、Trygve Helgerud、Tina Solvang、Christian A. Sperger、Anne Fiksdahl
DOI:10.1016/j.tetasy.2011.11.015
日期:2011.12
The preparation of new chiral symmetrically and unsymmetrically N,N'-disubstituted imidazolium based NHC salts Ib, IIb, IIIa-c and IVc-h from the amino acids L-proline and L-phenylalanine, is reported. Some preliminary tests have been carried out, demonstrating that the chiral NHCs give chiral induction in organometallic catalysis and can be used as organocatalysts. (C) 2011 Elsevier Ltd. All rights reserved.