Insights into the structural patterns of the antileishmanial activity of bi- and tricyclic N-heterocycles
作者:Lizzi Herrera、David E. Stephens、Abigail D'Avila、Kathryn G. George、Hadi Arman、Yu Zhang、George Perry、Ricardo Lleonart、Oleg V. Larionov、Patricia L. Fernández
DOI:10.1039/c6ob01149g
日期:——
various structural patterns in a series of novel bi- and tricyclic N-heterocycles on the activity against Leishmania major and Leishmania panamensis has been studied and compounds that are active in the low micromolar region have been identified. Both quinolines and tetrahydrooxazinoindoles (TOI) proved to have significant antileishmanial activities, while substituted indoles were inactive. We have also
Schtschukina; Sawizkaja, Zhurnal Obshchei Khimii, 1952, vol. 22, p. 1224,1226; engl. Ausg. S. 1269, 1
作者:Schtschukina、Sawizkaja
DOI:——
日期:——
Direct, Catalytic, and Regioselective Synthesis of 2-Alkyl-, Aryl-, and Alkenyl-Substituted <i>N</i>-Heterocycles from <i>N</i>-Oxides
作者:Oleg V. Larionov、David Stephens、Adelphe Mfuh、Gabriel Chavez
DOI:10.1021/ol403631k
日期:2014.2.7
A one-step transformation of heterocyclic N-oxides to 2-alkyl-, aryl-, and alkenyl-substituted N-heterocycles is described. The success of this broad-scope methodology hinges on the combination of copper catalysis and activation by lithium fluoride or magnesium chloride. The utility of this method for the late-stage modification of complex N-heterocycles is exemplified by facile syntheses of new structural
Intramolecular hydrogen bonding in 8-quinolinol N-oxides, quinaldinic acid N-oxides and quinoline-2-carboxyamide N-oxide. Deuterium isotope effects on 13C chemical shifts
作者:Teresa Dziembowska、Zbigniew Rozwadowski、Poul Erik Hansen
DOI:10.1016/s0022-2860(97)00117-8
日期:1997.12
correlation was found between δOH and n ΔC(OD) isotope effects. The OH and 13 C chemical shifts and n Δ C(OD) show very small temperature dependences. The primary isotope effects are small, positive and temperature insensitive. Furthermore, they increase with increasing n Δ C(OD). All features point towards a localised hydrogenbond in an asymmetric double well potential. The quinaldinic acid N -oxides
摘要 已在一系列喹啉、喹哪啶酸 N -氧化物和喹啉-2-羧酰胺 N -氧化物中测量了二次同位素对 13 C 化学位移的影响。对于 8-羟基喹啉氮氧化物,在 δOH 和 n ΔC(OD) 同位素效应之间发现了良好的相关性。OH 和 13 C 化学位移以及 n Δ C(OD) 显示出非常小的温度依赖性。主要同位素效应小、为正且对温度不敏感。此外,它们随着 n Δ C(OD) 的增加而增加。所有特征都指向不对称双阱势中的局部氢键。喹哪啶酸氮氧化物对两个符号的 13 C 化学位移均显示出长程同位素效应,其中 2 Δ CO(OD) 相当小。喹哪啶酸 N-氧化物的主要同位素效应约为 0.5 ppm,而其 4-乙氧基衍生物的影响较小,约为 0.3 ppm。OH 化学位移在 18-20 ppm 的低场共振,并且 OH 共振在室温下相当广泛,特别是对于 4-乙氧基衍生物。温度对化学位移、初级和次级同位素的影响很小。对于喹哪啶酸