有效地实现了布朗斯台德酸(p -TsOH·H 2 O)促进吡咯与N,N-二甲基氨基亚甲基戊二酸二腈的烷基化/环化级联反应,从而提供具有优异非对映选择性的官能化环戊[ b ]吡咯。环戊[ b ]吡咯的相应铵盐与甲基碘的脱氨基反应生成二氢环戊[ c ]吡咯。通过反应中间体,即2-烷基化吡咯的分离和转化,证实了级联反应途径。
Process for the preparation of 6-amino-nicotinonitriles
申请人:Bayer Aktiengesellschaft
公开号:US05480995A1
公开(公告)日:1996-01-02
6-Amino-nicotinonitriles of the formula ##STR1## can be prepared by reacting methylene-glutacononitriles of the formula ##STR2## with nitrogen compounds of the formula R.sup.1 --NH.sub.2 (III) at 0.degree. to 200.degree. C. in the presence or absence of an inert solvent. The ratio of nitrogen compound to glutacononitrile is 1 to 100:1. The substituents R.sup.1 and R.sup.4 have the meanings given in the description.
AbstractThe Brønsted acid‐mediated alkylation and alkenylation of indoles were efficiently achieved by means of 3‐(dimethylamino)acrylonitrile. Regulating the acidity of the reaction medium with para‐toluenesulfonic acid monohydrate (p‐TsOH⋅H2O) and/or acetic acid (HOAc) led to versatile formation of 3‐alkylated and 3‐alkenylated indole derivatives under mild conditions. The 3‐alkylated indole products could be nearly quantitatively transformed to the corresponding separable (E)‐ and (Z)‐3‐alkenylated indoles.magnified image
The Synthesis and Reactions of β-Chloroacrylonitrile
作者:F. Scotti、E. J. Frazza
DOI:10.1021/jo01030a033
日期:1964.7
Brønsted Acid-Promoted Cascade Alkylation/Cyclization of Pyrroles with<i>N</i>,<i>N</i>-Dimethylaminomethyleneglutaconic Acid Dinitrile: A Concise Route to Cyclopenta[<i>b</i>]pyrroles
A Brønstedacid (p-TsOH⋅H2O) promoted alkylation/cyclizationcascade reaction of pyrroles with N,N-dimethylaminomethyleneglutaconicaciddinitrile was efficiently realized to afford functionalized cyclopenta[b]pyrroles with excellent diastereoselectivity. Deamination of the corresponding ammonium salts of the cyclopenta[b]pyrroles with methyl iodide led to dihydrocyclopenta[c]pyrroles. The cascade reaction
有效地实现了布朗斯台德酸(p -TsOH·H 2 O)促进吡咯与N,N-二甲基氨基亚甲基戊二酸二腈的烷基化/环化级联反应,从而提供具有优异非对映选择性的官能化环戊[ b ]吡咯。环戊[ b ]吡咯的相应铵盐与甲基碘的脱氨基反应生成二氢环戊[ c ]吡咯。通过反应中间体,即2-烷基化吡咯的分离和转化,证实了级联反应途径。