A novel application of DDQ as electrophile in the Nenitzescu reaction
作者:U. Kucklaender、R. Bollig、W. Frank、A. Gratz、J. Jose
DOI:10.1016/j.bmc.2011.03.006
日期:2011.4
Reaction of 2,3-dichloro-5,6-dicyano-benzoquinone (DDQ) with secondary enaminones yields surprisingly 2-aza-spiro[4,5]decatrienes. The reaction occurs via cyclisation of the primary Michael-adduct with the nitrile group. Reaction of DDQ with tertiary and also certain secondary enamines leads to 3-amino-benzo[b]furan derivatives. This is formed not by Michael-addition, but via geminate radical ion pair
2,3-二氯-5,6-二氰基苯并醌(DDQ)与仲烯胺酮的反应令人惊讶地产生了2-氮杂-螺[4,5]癸二烯。该反应通过伯烷基加成基与腈基的环化而发生。DDQ与叔胺以及某些仲烯胺的反应生成3-氨基-苯并[ b ]呋喃衍生物。这不是通过迈克尔加成反应形成的,而是通过形成自由基自由基对并随后生成氧碳键生成苯并呋喃而形成的。对新产品进行了研究,以抑制纯化的人蛋白激酶CK2及其一般的细胞抑制活性。结果表明,活性最高的化合物是3-氨基-5-羟基-苯并呋喃衍生物11s,CK2的IC 50值为0.2μM。
Synthesis of polyfunctionalized benzophenones via the reaction of 3-formylchromones with tertiary push–pull enamines
作者:Alexey Yu. Barkov、Vladislav Yu. Korotaev、Igor B. Kutyashev、Vyacheslav Ya. Sosnovskikh
DOI:10.1016/j.tet.2016.03.005
日期:2016.4
Uncatalyzed nucleophilic reaction of 3-formylchromones with tertiary push–pull enamines in refluxing acetonitrile gave polyfunctionalized benzophenone derivatives as a result of a [3+3] annulation in moderate to good yields.
2-Functionalized 4-nitroanilines were readily synthesized by ringtransformation using 3,5-dinitro-2-pyridone and enaminones prepared from 1,3-dicarbonyl compounds and amines. Modification of the amino group and the ortho-position could be achieved by simply changing the enaminones. Using this strategy, functional groups such as acetyl, benzoyl, and ethoxycarbonyl groups could be introduced into the