喹诺酮类似物1. 1-烷基-4-氧代-1,4-二氢吡啶并[3,4- b ]喹喔啉-3-羧酸的便捷合成†
摘要:
烷基肼基喹喔啉N-氧化物2a-d与乙炔二羧酸二甲酯的反应得到了甲基1-烷基-1,5-二氢吡啶并嗪[3,4- b ]喹喔啉-3,4-二羧酸酯3a-d,其与亚硝酸的反应有效进行C 4氧化,分别得到二甲基1-烷基-4-羟基-1,4-二氢哒嗪-[3,4- b ]喹喔啉-3,4-二羧酸酯4a-d。化合物4a-d与1,8-二氮杂双环[5.4.0] -7-十一碳烯在乙醇中的反应提供了乙基1-烷基-4-氧代-1,4-二氢吡啶并[3,4- b ]喹喔啉-3-羧酸盐5a-d,同时化合物发生反应用氢氧化钾在4a-d中分别提供1-烷基-4-氧代-1,4-二氢吡啶并[3,4- b ]喹喔啉-3-羧酸6a-d。化合物6c,d也分别通过化合物5c,d与氢氧化钾反应获得。
Copper-Catalyzed Direct Sulfoximination of Heteroaromatic<i>N</i>-Oxides by Dual C−H/N−H Dehydrogenative Cross-Coupling
作者:Hao Yu、Carl Albrecht Dannenberg、Zhen Li、Carsten Bolm
DOI:10.1002/asia.201500875
日期:2016.1
A dual C−H/N−H dehydrogenativecoupling of quinoline‐type N‐oxides with sulfoximines that leads to N‐(hetero)arylsulfoximines in high yields has been realized by using a catalytic amount of CuBr in air. The method does not require any additional ligand, base, reactivity modifier or oxidant and provides a practical route towards a series of sulfoximidoyl‐functionalized quinolines and derivatives.
通过在空气中使用催化量的CuBr,实现了喹啉型N-氧化物与亚砜肟的双重CH / H / NH脱氢偶联,可高产率地产生N-(杂)芳基亚砜肟。该方法不需要任何额外的配体,碱,反应性改性剂或氧化剂,并提供了一条通向一系列磺酰亚氨基酰基官能化的喹啉及其衍生物的实用途径。
Quinoxalines. XXVII. The cyanation of 2-substituted quinoxaline 4-oxides with trimethylsilyl cyanide.
作者:Chihoko IIJIMA、Akira MIYASHITA
DOI:10.1248/cpb.38.661
日期:——
The deoxy-cyanation of 2-substituted quinoxaline 4-oxides (Ia-k) with trimethylsilyl cyanide in the presence of 1, 8-diazabicyclo[5.4.0]undec-7-ene gave the corresponding 3-substituted 2-quinoxalinecarbonitriles (IIa-k). However, in the case of 2-(p-tolylsulfonyl)quinoxaline 4-oxide (II), the substitution with cyanide ion proceeded together with deoxy-cyanation to give 2, 3-quinoxalinedicarbonitrile (III).
Studies in quinoxaline series. Part 18. Structure of products of a new reaction of tetrazolo[1,5-a]quinoxaline 5-oxide with carbanions. X-Ray molecular structure of 4-acetyl-4-methyl-3b,4-dihydroazirino[1,2-a]tetrazolo-[5,1-c]quinoxaline
to give a racemic mixture of the derivatives of aziridinotetrazoloquinoxaline 10 and 11. Their structure and the trans configuration of hydrogen atom and methyl group on the aziridine ring of compound 10 were estimated by means of 1H and 13C NMR spectroscopy, and were in accord with the results of X-ray diffraction measurements, which also provided bond lengths, and valence, torsion, and dihedral angles
替他唑并[1,5- a ]喹喔啉-5-氧化物4与β-二酮和β-酮酯的碳负离子反应,分别得到烯氨基酮和烯氨基酯。所述Ñ氧化物4种发生反应与在类似条件下3-甲基和3-乙基戊烷-2,4-二酮,得到aziridinotetrazoloquinoxaline的衍生物的外消旋混合物10和11。通过1 H和13估算它们的结构以及化合物10的氮丙啶环上氢原子和甲基的反式构型1 H NMR光谱,并且与X射线衍射测量的结果一致,该X射线衍射测量还提供了键长,以及化合价,扭转和二面角。
Synthesis, crystal structure and calculation of oxides of 2-methylamino-3-methyl quinoxaline
作者:Rui Wang、Min Zhang、Wenfeng Wang、Xucheng Wang、Yaofeng Yuan、Junjian Li
DOI:10.1016/j.molstruc.2020.128826
日期:2020.12
Abstract Monoxide and dioxide of animo quinoxaline were synthesized and characterized by 1H NMR, 13C NMR and HRMS. The result shows that monoxide is main product. 1H NMR analysis, quantum calculation and crystalstructure all indicate that the monoxide is 4-oxide structure but not 1-oxide structure. The subsequent discussions of electronic effect and steric effect of 1-oxide and 4-oxide support the
A New Efficient Route for the Formation of Quinoxaline <i>N</i>-Oxides and <i>N,N</i><i>‘</i>-Dioxides Using HOF·CH<sub>3</sub>CN
作者:Mira Carmeli、Shlomo Rozen
DOI:10.1021/jo0608016
日期:2006.7.1
HOF·CH3CN, a very efficient oxygen-transfer agent made readily from fluorine and aqueous acetonitrile, was reacted with various quinoxaline derivatives to give the corresponding mono N-oxides and especially the N,N‘-dioxides in very good yields under mild conditions and short reaction times.