Assisted tandem catalytic RCM-aromatization in the synthesis of pyrroles and furans
作者:Bernd Schmidt、Stefan Krehl、Eric Jablowski
DOI:10.1039/c2ob25543j
日期:——
An assisted tandem catalytic transformation of diallyl amines and diallyl ethers into N-aryl pyrroles and furans, respectively, is described. The sequence relies on ring closing metathesis followed by dehydrogenation of the initially formed dihydropyrroles and dihydrofurans. Both steps are Ru-catalyzed, but the sequence requires only one precatalyst, because conversion of the metathesis catalyst into
Boron trifluoride-diethyl ether complex (BF3⋅OEt2) was demonstrated to be an efficient catalyst for the amino-Claisen rearrangements of various aromatic N-allylamines into the corresponding o-allylamines in moderate yields.
An Asymmetric Organocatalytic Quadruple Cascade Initiated by a Friedel-Crafts-Type Reaction with Electron-Rich Arenes
作者:Nico Erdmann、Arne R. Philipps、Iuliana Atodiresei、Dieter Enders
DOI:10.1002/adsc.201201099
日期:2013.3.25
An organocatalyticquadruple domino reactioninitiated by a Friedel–Crafts‐type reaction of electron‐rich arenes is described. The procedure involving up to three different Michael acceptors afforded highly functionalized cyclohexenecarbaldehydes bearing an aniline moiety, which are of great pharmaceutical and agricultural interest. This diphenylprolinol trimethylsilyl ether‐catalyzed reaction also
Monocarboxylate Transporter 1 Inhibitors as Potential Anticancer Agents
作者:Shirisha Gurrapu、Sravan K. Jonnalagadda、Mohammad A. Alam、Grady L. Nelson、Mary G. Sneve、Lester R. Drewes、Venkatram R. Mereddy
DOI:10.1021/acsmedchemlett.5b00049
日期:2015.5.14
Potent monocarboxylate transporter I inhibitors (MCTI) have been developed based on alpha-cyano-4-hydroxycinnamic acid template. Structure-activity relationship studies demonstrate that the introduction of p-N, N-dialkyl/diaryl, and o-methoxy groups into cyanocinnamic acid has maximal MCT1 inhibitory activity. Systemic toxicity studies in healthy ICR mice with few potent MCTI inhibitors indicate normal body weight gains in treated animals. In vivo tumor growth inhibition studies in colorectal adenocarcinoma (WiDr cell line) in nude mice xenograft models establish that compound 27 exhibits single agent activity in inhibiting the tumor growth.
Highly efficient Ru(<scp>ii</scp>)–alkylidene based Hoveyda–Grubbs catalysts for ring-closing metathesis reactions
作者:Mariam Y. Al-Enezi、Elizabeth John、Yehia A. Ibrahim、Nouria A. Al-Awadi
DOI:10.1039/d1ra07428h
日期:——
Three novel phosphine-free Ru-alkylidenes (7a–7c) have been synthesized and utilized as efficient catalysts for ring closing metathesis (RCM) reaction. Spectroscopic data, i.e. NMR and HRMS, along with single crystal X-ray diffraction analysis, were used to confirm their chemical structures. The tosylated carbenoid 7b showed the highest efficiency in cyclizing different acyclic diene substrates. RCM
已经合成了三种新型的不含膦的 Ru-亚烷基 ( 7a-7c ),并将其用作闭环复分解 (RCM) 反应的有效催化剂。光谱数据,即NMR 和 HRMS,以及单晶 X 射线衍射分析,用于确认它们的化学结构。甲苯磺酰化的类胡萝卜素7b在环化不同的无环二烯底物方面表现出最高的效率。与众所周知的 Grubbs 相比,仅使用催化量 (0.5–2.0 mol%) 的添加剂催化剂 ( 7b ) 就可以很好地耐受各种(未)取代的N、N-二烯丙基苯胺衍生物的 RCM 和不同大分子二烯的立体选择性 RCM (II) 和 Hoveyda-Grubbs (II) 催化剂。