The Reaction of Meldrum's Acid and Its Derivatives with Conjugated Azoalkenes: A Convenient Route to 1-Amino-1<i>H</i>-pyrrol-2(3<i>H</i>)-ones
作者:Antonio Arcadi、Orazio A. Attanasi、Zhiyuan Liao、Franco Serra-Zanetti
DOI:10.1055/s-1994-25532
日期:——
The reaction of Meldrum's acid and its 5-substituted derivatives with conjugated azoalkenes in the presence of triethylamine produces, via 1,4-conjugate addition, corresponding hydrazones which undergo decarboxylative alcoholysis and simultaneous cyclization to give 3-unsubstituted and 3-monosubstituted 1-amino-1H-pyrrol-2-(3H)-ones respectively.
Divergent Approach to Thiazolylidene Derivatives: A Perspective on the Synthesis of a Heterocyclic Skeleton from β-Amidothioamides Reactivity
作者:Stefania Santeusanio、Roberta Majer、Francesca Romana Perrulli、Lucia De Crescentini、Gianfranco Favi、Gianluca Giorgi、Fabio Mantellini
DOI:10.1021/acs.joc.7b02135
日期:2017.9.15
Herein we report a domino protocol able to reach regioselectively thiazolylidene systems by combining the reactive peculiarities of both β-amidothioamides (ATAs) and 1,2-diaza-1,3-dienes (DDs). Depending on the reaction conditions and/or the nature of the residue at C4 of the heterodiene system, ATAs can act as hetero-mononucleophiles or hetero-dinucleophiles in the diversified thiazolylidene ring
FeCl
<sub>3</sub>
‐Catalyzed Formal [3+2] Cyclodimerization of 4‐Carbonyl‐1,2‐diaza‐1,3‐dienes
作者:Giacomo Mari、Matteo Corrieri、Lucia De Crescentini、Gianfranco Favi、Stefania Santeusanio、Fabio Mantellini
DOI:10.1002/ejoc.202101046
日期:2021.10.7
An 1,2-diaza-1,3-diene's cyclodimerization that provides symmetrical fully substituted 1-amino pyrroles through an unusual formal [3+2] reaction is investigated. The study has demonstrated that the presence of electron withdrawing groups on the terminal carbon atom of the azo-ene system is crucial for the success of the reaction. The synthesis occurs with complete regioselectivity and requires a very
Conjugated azoalkenes. Part VI. α-Olefinated carbonyl derivatives by treatment of azoalkenes with carbomethoxymethylene triphenylphosphorane
作者:Orazio A. Attanasi、Paolino Filippone、Stefania Santeusanio
DOI:10.1016/s0040-4039(00)82192-9
日期:1988.1
α-Olefinated carbonyl derivatives have been obtained in good yield under very mild conditions by Wittig-type reaction of some conjugated azoalkenes with carbomethoxymethylene triphenylphosphorane. The reaction mechanism seems to implicate zwitterionic rather than cycloadduct intermediate, as usual for the Wittig reaction.
[EN] 7-HYDROXY-PYRAZOLO[1,5-A] PYRIMIDINE COMPOUNDS AND THEIR USE AS CCR2 RECEPTOR ANTAGONISTS<br/>[FR] COMPOSÉS 7-HYDROXY-PYRAZOLO-[1,5-A] PYRIMIDINE ET LEUR UTILISATION COMME ANTAGONISTES DU RÉCEPTEUR CCR2
申请人:PROXIMAGEN LTD
公开号:WO2012041817A1
公开(公告)日:2012-04-05
The compounds of formula (I) are antagonists of the CCR2 receptor Wherein R1-7 and A are as defined in the claims.