A general method for the preparation of alpha-hydroxyacetophenones is presented. Functionalized arylmagnesium species are transmetalated to the corresponding arylzinc intermediates, which undergo Cu(I)-catalyzed reaction with acetoxyacetyl chloride. Acidic hydrolysis of the acetate group releases the target alpha-hydroxyacetophenones with minimal production of undesired polymeric degradates that are often observed under alternative conditions.
Decarboxylative Oxyacyloxylation of Propiolic Acids: Construction of Alkynyl-Containing α-Acyloxy Ketones
作者:Xin Chen、Yangchun Xin、Zhi-Wei Zhao、Yu-Jian Hou、Xiang-Xiang Wang、Wen-Jin Xia、Ya-Min Li
DOI:10.1021/acs.joc.1c00669
日期:2021.6.18
Novel decarboxylative oxyacyloxylation of propiolic acids has been developed. This reaction provides an efficient access to alkynyl-containing α-acyloxy ketones from readily available starting materials and exhibits significant functional group tolerance. Furthermore, oxyacyloxylation of terminal alkynes and aliphatic propiolic acids was also developed. A possible reaction mechanism is proposed based
Activity of 6-aryl-pyrrolo[2,3-d]pyrimidine-4-amines to Tetrahymena
作者:Svein Jacob Kaspersen、Eirik Sundby、Colin Charnock、Bård Helge Hoff
DOI:10.1016/j.bioorg.2012.06.003
日期:2012.10
and the para-bromo substituted derivatives had the lowest minimum protozoacidal concentrations (8–16 μg/mL). Surprisingly, both enantiomers were found to have high potency suggesting that this compound class could have several modes of action. No correlation was found between the compounds protozoacidal activity and the in vitro epidermal growth factor receptor tyrosine kinase inhibitory potency. This
测试了一系列的6-芳基-吡咯并[2,3- d ]嘧啶-4-胺(43种化合物),其中一些是表皮生长因子酪氨酸激酶抑制剂,使用环境四膜虫菌株作为模型生物对它们的原生动物毒性进行了测试。发现类似物的原酸活性高度依赖于6-芳基环上的4-羟基和4位上的手性1-苯基乙胺取代基。此外,效力受到苯基乙胺的芳族取代模式的影响。 :未取代的,间-氟和对位-溴取代的衍生物的最低原生动物酸浓度最低(8–16μg/ mL)。令人惊讶地,发现两种对映异构体均具有高效力,这表明该化合物类别可具有多种作用方式。化合物的原酸活性与体外表皮生长因子受体酪氨酸激酶抑制能力之间没有相关性。这表明观察到的抗菌作用与其他目标有关。对一组激酶的测试表明了几种替代的作用方式。