Preparation of <i>N</i>-Arylquinazolinium Salts via a Cascade Approach
作者:Mani Ramanathan、Jing Wan、Shiuh-Tzung Liu
DOI:10.1021/acs.joc.9b00601
日期:2019.6.7
readily available aryldiazonium salts, nitriles, and 2-aminoarylketones in a one-pot operation. This method relies on the in situ generation of the N-arylnitrilium intermediate from the reaction of aryldiazonium salt with nitrile, which undergoes amination/cascade cyclization/aromatization, leading to N-arylquinazolinium salts in excellent yields. Nucleophilic addition of alkoxide to these N-arylquinazolinium
Inhibition of the Cysteine Protease Human Cathepsin L by Triazine Nitriles: Amide⋅⋅⋅Heteroarene π-Stacking Interactions and Chalcogen Bonding in the S3 Pocket
We report an extensive “heteroarene scan” of triazinenitrile ligands of the cysteine protease human cathepsin L (hCatL) to investigate π‐stacking on the peptide amide bond Gly67–Gly68 at the entrance of the S3 pocket. This heteroarene⋅⋅⋅peptide bond stacking was supported by a co‐crystal structure of an imidazopyridine ligand with hCatL. Inhibitory constants (Ki) are strongly influenced by the diverse
我们报道了半胱氨酸蛋白酶人组织蛋白酶L(hCatL)的三嗪腈配体的广泛的“杂芳烃扫描”,以研究S3口袋入口处的肽酰胺键Gly67–Gly68上的π堆积。杂芳基·····肽键的堆叠由咪唑并吡啶配体与hCatL的共晶体结构支持。抑制常数(ķ我)受到杂环的多样性和与S3口袋局部环境的特定相互作用的强烈影响。结合亲和力变化三个数量级。与烃类似物相比,所有杂芳族配体均具有增强的结合力。从杂芳烃和肽键的局部偶极矩的方向预测的能量贡献无法得到证实。分子间的C-S⋅⋅⋅O= C相互作用(硫族元素键)与Asn66的主链C = O增强了苯并噻吩基(K i = 4 n m)和苯并噻唑基(K i = 17 n m)配体的结合。 S3口袋。还测试了配体的相关酶罗德沙星。
Gold and palladium combined for the Sonogashira-type cross-coupling of arenediazonium salts
作者:Biswajit Panda、Tarun K. Sarkar
DOI:10.1039/c001277g
日期:——
The Sonogashira-type cross-coupling of arenediazoniumsalts is reported for the first time using a Pd-Au dual catalytic system.
首次报道了使用Pd-Au双催化系统对苯二氮杂鎓盐的Sonogashira型交叉偶联。
Visible Light‐Catalyzed Decarboxylative Alkynylation of Arenediazonium Salts with Alkynyl Carboxylic Acids: Direct Access to Aryl Alkynes by Organic Photoredox Catalysis
salts have been utilized as the aryl radical source to couple alkynyl carboxylic acids to feature the decarboxylative arylation. A wide range of substrates are amenable to this protocol with broad functional group tolerance, and diversely‐functionalized aryl alkynes could be synthesized undermild, neutral and transition metal‐free reaction conditions using visiblelight irradiation. Alongside synthetic
Formation of η<sup>2</sup>-aroyl, η<sup>1</sup>-halogenocarbyne or sterically crowded aryldiazenide ligands in the reactions of ring-substituted tricarbonyl[hydrotris(pyrazolyl)borato]-molybdate and -tungstate anions with arenediazonium cations and related oxidants
作者:Fergus J. Lalor、Timothy J. Desmond、Gerard M. Cotter、Claire A. Shanahan、George Ferguson、Masood Parvez、Barbara Ruhl
DOI:10.1039/dt9950001709
日期:——
with 3- or 4-substituted arenediazonium cations [R′N2]+ yielding carbonyl-substitution (i.e. aryldiazenido) products [MoHB(pz)3}(CO)2(N2R′)]. reaction of the methylsubstituted analogue [ML*(CO)3]–[L*= tris(3,5-dimethylpyrazolyl)hydroborate; M = Mo or W] led, via oxidative formation of aryl radicals and [ML*(CO)3]˙, to η2-aroyl complexes [ML*(CO)2(η2-COR′)][R′= C6H4X-4 (X = NO2, CN, COMe, CF3, H, Me
尽管氢三(吡唑基)硼酸盐络合物[Mo HB(pz)3 }(CO)3 ] –与3-或4-取代的芳族重氮阳离子[R'N 2 ] +反应,生成羰基取代(即芳基二氮杂)产品[ Mo HB(pz)3 }(CO)2(N 2 R')]。甲基取代的类似物[ML *(CO)3 ] – [L * =三(3,5-二甲基吡唑基)氢硼酸酯的反应;M = Mo或W]为首,通过芳基的氧化形成和[ML *(CO)3 ]˙,至η 2种芳酰基配合物[ML *(CO)2(η 2-COR')] [R'= C 6 H 4 X-4(X = NO 2,CN,COMe,CF 3,H,Me,OMe或NMe 2)或C 6 H 4 X-3(X = NO 2或OMe)]在乙腈中,或在卤代烷烃CH 2 Cl 2或CHX 3(X = Br或X )的存在下与卤代碳炔络合物[ML *(CO)2(CX)](X = Cl,Br或I)。一世)。复杂的[MoL