The use of enaminones and enamines as effective synthons for MSA-catalyzed regioselective synthesis of 1,3,4-tri- and 1,3,4,5-tetrasubstituted pyrazoles
In the present work, an efficient regioselectivesynthesis of 1,3,4-tri- and 1,3,4,5-tetrasubstituted pyrazoles via a methanesulfonic acid (MSA)-catalyzed reaction of hydrazones with enaminones or enamines is reported. Mechanistically, the formation of the title compounds involves the [2+3] cycloaddition of hydrazones with enaminones or enamines followed by aromatization with acid and oxygen. This
Scalable synthesis of enaminones utilizing Gold's reagents
作者:Alexander W. Schuppe、James M. Cabrera、Catherine L.B. McGeoch、Timothy R. Newhouse
DOI:10.1016/j.tet.2017.03.092
日期:2017.6
chloride and N,N-dialkylformamides. These synthetic equivalents of N,N-dimethylformamide dimethyl acetal were used in an optimized and scalable procedure for the regioselective synthesis of a variety of enaminones from ketone starting materials, whose utility was demonstrated by the stereoselective synthesis of Rawal-type dienes.
Process for converting propargylic amine-N-oxides to enaminones
申请人:American Home Products Corporation
公开号:US05932745A1
公开(公告)日:1999-08-03
This invention concerns the use of a hydroxylic solvent in the preparation of enaminones from the corresponding amine N-oxides or propargylic amines via the general process outlined below: ##STR1##
The Synthesis of 7-Substituted-2,3-dihydropyrido [4,3-d]pyridazine-1,4-diones and 1,4-Dioxo-7-substituted- 1,2,3,4-tetrahydropyrido[4,3-d]pyridazine 6-Oxides from Methyl Ketones
作者:Benjamin Prek、Branko Stanovnik
DOI:10.17344/acsi.2017.3695
日期:2017.12.15
5-dicarboxylates and their N-oxides and final cyclization with hydrazine hydrate into of 7-substituted-2,3-dihydropyrido[3,4-d]pyridazine-1,4-diones and 1,4-dioxo-7-substituted-1,2,3,4-tetrahydropyrido[4,3-d]pyridazine 6-oxides is shown.
Highly Fluorescent Pyrido[2,3-<i>b</i>
]indolizine-10-Carbonitriles through Pseudo Three-Component Reactions of <i>N</i>
-(Cyanomethyl)pyridinium Salts
作者:Ekaterina A. Sokolova、Alexey A. Festa、Nikita E. Golantsov、Natalia S. Lukonina、Ilya N. Ioffe、Alexey V. Varlamov、Leonid G. Voskressensky
DOI:10.1002/ejoc.201900995
日期:2019.10.31
A novel class of effective fluorophores, incorporating the pyrido[2,3‐b]indolizine scaffold, has been discovered. The synthesis of pyridoindolizines involves one synthetic step from readily available starting materials.
已发现一类新型的有效荧光团,其中掺入了吡啶并[2,3- b ]吲哚嗪骨架。吡啶并吲哚并恶嗪的合成涉及从容易获得的起始原料开始的一个合成步骤。