Reactions of alkyl 4-aminobenzoates with maleic anhydride give the corresponding alkyl 4-(2,5-di-oxo-2,5-dihydro-1H-pyrrol-1-yl)benzoates, and the latter are converted into 4-(3-dialkylamino-2,5-dioxo-2,3,4,5-tetrahydro- 1H-pyrrol-1-yl)benzoates by treatment with secondary amines.
摘要我们在不存在催化剂的情况下,通过氨基苯甲酸或氨基苯甲酸酯,马来酸酐和异戊二烯之间的多组分反应(MCR),对一些六氢异吲哚基苯甲酸及其相应的乙酯进行了合成和表征。根据其他实验,MCR是通过依次从氨基苯甲酸或氨基苯甲酸酯和顺丁烯二酸酐,酸和异戊二烯的Diels–Alder加合物,最后是酰亚胺形成N-芳基马来酰胺酸而发生的。加合物的1 H NMR数据(耦合常数)表明,相应的环己烯环的优选构型是顺式-船,由密度泛函理论(DFT)构象分析和相应构象异构体自旋-自旋耦合常数的DFT计算所支持的事实。我们的MCR合成方法在其他加合物的合成中成功进行了测试,其中使用了环戊二烯和其他苯胺。 图形概要
Propanephosphonic Acid Anhydride–Mediated Cyclodehydration of Maleic Acid Monoamides
作者:Igors Klimenkovs、Eduards Bakis、Anda Priksane
DOI:10.1080/00397911.2012.727060
日期:2013.10.2
Propanephosphonic acid anhydride (T3P) has been proposed as a novel reagent for the preparation of maleic acid isoimides from the corresponding monoamides. A series of substituted aromatic and aliphatic isoimides have been prepared in good yields. The main advantage of this synthetic method is the use of environmentally benign, cost-efficient reagents and solvents, which are also safer to handle than the ones employed previously. Supplemental materials are available for this article. Go to the publisher's online edition of Synthetic Communications (R) to view the free supplemental file.
SALTS OF PAROXETINE
申请人:SMITHKLINE BEECHAM PLC
公开号:EP1091958A1
公开(公告)日:2001-04-18
[EN] SALTS OF PAROXETINE<br/>[FR] SELS DE PAROXETINE
申请人:SMITHKLINE BEECHAM PLC
公开号:WO2000001692A1
公开(公告)日:2000-01-13
Piperidine compounds, processes for preparing them, pharmaceutical compositions comprising them and their use in therapy are disclosed.