A palladium catalyzed atom-efficient cross-coupling reactivity of triarylbismuths with α,β-unsaturated acyl chlorides
作者:Maddali L.N. Rao、Varadhachari Venkatesh、Deepak N. Jadhav
DOI:10.1016/j.jorganchem.2008.05.012
日期:2008.7
An atom-efficientcross-coupling reactivity of triarylbismuths (1 equiv) was demonstrated by cross-couplingreaction with 3 equiv of α,β-unsaturated acylchlorides under palladium catalysis in the synthesis of a series of functionalized α, β-unsaturated ketones in high isolated yields.
a carbon-centered radicalintermediate, which will overcome side reactions during the styrene radical functionalization process. Experimental studies have provided evidence indicating a domino-fluorination–protodefluorination pathway with α-keto acid initiating the photoredox cycle. The present catalytic protocol also affords a novel approach for the construction of α,β-unsaturated ketones under mild
Catalyzed Claisen–Schmidt reaction by protonated aluminate mesoporous silica nanomaterial focused on the (E)-chalcone synthesis as a biologically active compound
作者:Mohammad Reza Sazegar、Shaya Mahmoudian、Ali Mahmoudi、Sugeng Triwahyono、Aishah Abdul Jalil、Rino R. Mukti、Nur H. Nazirah Kamarudin、Monir K. Ghoreishi
DOI:10.1039/c5ra23435b
日期:——
catalyzed the synthesis of (E)-chalcones through the Claisen–Schmidt reaction. Chalcone derivatives have been applied as biologically active compounds with anti-cancer, anti-inflammatory and diuretic pharmacological activities. The products were obtained via reactions on the protonic acid sites of HAlMSN. The significant advantages of this reaction are high yield, easy work up, short reaction time and also
介孔二氧化硅结构(MSN)是使用溶胶-凝胶法合成的,然后进行铝接枝和质子化,然后表示为HAlMSN(Si / Al = 18.9)。N 2的物理吸附证实了具有3.38 nm孔径的中孔结构。27 Al NMR显示存在骨架和骨架外的铝结构,这导致形成很强的Lewis和Brønsted酸性位。HAlMSN通过Claisen-Schmidt反应催化(E)-查耳酮的合成。查耳酮衍生物已被用作具有抗癌,抗炎和利尿药理活性的生物活性化合物。产品是通过以下途径获得的HAlMSN质子酸位点上的反应 该反应的显着优点是产率高,易于后处理,反应时间短以及与各种有机溶剂的相容性。得到的产物在298 K下具有97%的优异转化率。结果表明,与吸电子取代基相比,给电子取代基表现出更高的转化率。通过将其重复使用五次以生产(E)-查耳酮来研究催化剂的稳定性,并且其催化活性仅略微降低。最高产品(E在苯甲醛/苯乙酮的摩尔比为1
Rasschaert,A. et al., Bulletin des Societes Chimiques Belges, 1966, vol. 75, p. 449 - 455
Using amino acid as a catalyst, an inexpensive, nontoxic, environmentally friendly, metal-free reaction procedure for C-S bond formation via thio-Michael addition reaction has been developed. The thio-Michael addition products were obtained in excellent yields under mild and neutral conditions. This metal-free catalytic protocol was found to be a good alternative to the existing metal catalyst methodology for the thio-Michael addition reaction. (c) 2007 Elsevier Ltd. All rights reserved.