Four- and Sixfold Tandem-Domino Reactions Leading to Dimeric Tetrasubstituted Alkenes Suitable as Molecular Switches
作者:Lutz F. Tietze、Bernd Waldecker、Dhandapani Ganapathy、Christoph Eichhorst、Thomas Lenzer、Kawon Oum、Sven O. Reichmann、Dietmar Stalke
DOI:10.1002/anie.201503538
日期:2015.8.24
A highly efficient palladium‐catalyzed fourfold tandem‐domino reaction consisting of two carbopalladation and two CH‐activation steps was developed for the synthesis of two types of tetrasubstitutedalkenes 3 and 6 with intrinsic helical chirality starting from substrates 1 and 4, respectively. A sixfold tandem‐domino reaction was also developed by including a Sonogashira reaction. 20 compounds with
Highlyenantioselective hydrogenation of seven-membered cyclic imines, substituted dibenzo[b,f][1,4]oxazepines, was achieved, with up to 94% ee, by using the [Ir(COD)Cl](2)/(S)-Xyl-C(3)*-TunePhos complex as the catalyst in the presence of morpholine-HCl.
Synthesis of unsymmetrical biaryl ethers through nickel-promoted coupling of polyfluoroarenes with arylboronic acids and oxygen
作者:Jian Zhang、Jingjing Wu、Yang Xiong、Song Cao
DOI:10.1039/c2cc33755j
日期:——
Polyfluoro-substituted unsymmetrical biaryl ethers were synthesized via a novel Ni-catalyzed cross-coupling reaction of polyfluoroarenes with arylboronic acids and oxygen. The polyfluorinated arenes presumably captured the phenoxide intermediate efficiently, which made the oxygen-insertion proceed smoothly via the SNAr protocol. The 18O labeling experiment demonstrated that the oxygen introduced into unsymmetrical diaryl ether originated from very trace amounts of oxygen in the reaction system. A plausible mechanism was also suggested.
Design, synthesis and antifungal activity of novel furancarboxamide derivatives
作者:Fang Wen、Hong Jin、Ke Tao、Taiping Hou
DOI:10.1016/j.ejmech.2016.04.060
日期:2016.9
Twenty-seven novel furancarboxamide derivatives with a diphenyl ether moiety were synthesized and evaluated for their antifungalactivity against Rhizoctonia solani, Botrytis cirerea, Valsa mali and Sphaceloma ampelimum. Antifungal bioassay results indicated that most compounds had good or excellent fungicidal activities for R. solani and S. ampelimum at 20 mg L−1. Among synthesized compounds, compound
合成了具有二苯醚部分的二十七种新颖的呋喃甲酰胺衍生物,并评估了其对茄状枯萎病菌,蜡状葡萄孢菌,马来酸缬草和安非球菌的抗真菌活性。抗真菌生物测定结果表明,在20 mg L -1时,大多数化合物对sol。R. solani和S. ampelimum具有良好或优异的杀真菌活性。在合成的化合物中,化合物18e对氨苄青霉有更大的抑制作用,最大有效浓度(EC 50)值的一半为0.020 mg L -1。这种强大的活性可与目前使用的商业杀菌剂(例如Boscalid和多菌灵)竞争,并且作为新型杀菌剂未来开发的主导化合物具有巨大的潜力。