A novel palladium-catalyzed interannular selective C-H silylation of 1,1'-biaryl-2-acetamides is described. The combination of palladium catalyst with copper oxidant enables meta- or ortho-selective C-H silylation by employing hexamethyldisilane as a trimethylsilyl source, which relies on the control of NBE derivatives as a switch, thus providing straightforward access to divergent silicon-containing 1,1'-biaryl-2-acetamides.
Driving Recursive Dehydration by P<sup>III</sup>/P<sup>V</sup> Catalysis: Annulation of Amines and Carboxylic Acids by Sequential C–N and C–C Bond Formation
作者:Morgan Lecomte、Jeffrey M. Lipshultz、Shin-Ho Kim-Lee、Gen Li、Alexander T. Radosevich
DOI:10.1021/jacs.9b06277
日期:2019.8.14
A method for the annulation of amines and carboxylicacids to form pharmaceutically relevant azaheterocycles via organophosphorus PIII/PV redox catalysis is reported. The method employs a phosphetane catalyst together with a mild bromenium oxidant and terminal hydrosilane reductant to drive successive C–N and C–C bond-forming dehydration events via the serial action of a catalytic bromophosphonium
dehydrogenative rearomatization of hydrogenation product and poisoning effect of nitrogen atom, asymmetric hydrogenation of polycyclic nitrogen‐containing heteroaromatics is still a great challenge. Herein, through in situ protection of hydrogenation products with acetic anhydride to inhibit rearomatization and poisoning effect, a novel iridium‐catalyzed enantioselectivehydrogenation of polycyclic nitrogen‐containing
由于氢化产物的脱氢重新芳构化和氮原子的中毒作用,多环含氮杂芳族化合物的不对称氢化仍然是一个巨大的挑战。这里,通过在原位用乙酸酐来抑制rearomatization和中毒效果,多环含氮杂的新型铱-催化的对映选择性氢化的氢化产物保护-吡咯并/吲哚并[1,2一]喹喔啉和菲啶-已经成功可以轻松获得高达98%ee的手性二氢吡咯并/吲哚并[1,2- a ]喹喔啉和二氢菲啶。该策略具有广泛的底物范围,易于操作和潜在的医学应用。
Pyrrolo[1,2‐
<i>a</i>
]quinoxalines: Insulin Mimetics that Exhibit Potent and Selective Inhibition against Protein Tyrosine Phosphatase 1B
作者:Javier García‐Marín、Mercedes Griera、Patricia Sánchez‐Alonso、Bruno Di Geronimo、Francisco Mendicuti、Manuel Rodríguez‐Puyol、Ramón Alajarín、Beatriz Pascual‐Teresa、Juan J. Vaquero、Diego Rodríguez‐Puyol
DOI:10.1002/cmdc.202000446
日期:2020.10.5
analogues bearing chlorine atoms at C7 and/or C8 kept potency and showed good selectivity compared to TCPTP (selectivity index >40). The most potent inhibitors behaved as insulin mimetics by increasing glucose uptake. The 4‐benzyl derivative inhibited insulin receptor substrate 1 and AKT phosphorylation. Molecular docking and molecular dynamics simulations supported a putative binding mode for these compounds
An original series of 4-substituted pyrrolo[1,2-a]quinoxaline derivatives, new structural analogues of Galipea species quinoline alkaloids, was synthesized from various substituted 2-nitroanilines via multistep heterocyclizations and tested for in vitro antiparasitic activity upon Leishmania amazonensis and Leishmania infantum strains. Structure-activity relationships enlighten the importance of the 4-substituted alkenyl side chain on the pyrrolo[1,2-a]quinoxaline moiety to modulate the antileishmanial activity. (c) 2006 Elsevier Ltd. All rights reserved.
Cheeseman, G. W. H.; Hawi, A. A., Journal of Heterocyclic Chemistry, 1983, vol. 20, p. 585 - 590