1-Arylamino-1-methylthio-2-nitroethene in superacids: NMR study and reactivity of the formed hydroxynitrilium lons
作者:Jean-Marie Coustard
DOI:10.1016/0040-4020(96)00485-1
日期:1996.7
temperature in triflic acid, 1-arylamino-1-methylthio-2-nitroethylenes give firstly C, O-protonated species then a conjugated dication with aryliminium and hydroxynitrilium sites. The last one was trapped in situ with aromatic or quenched with MeOH or MeSH to form aryliminohydroxyimino derivatives. Intramolecular reaction occurs when temperature rises. Effect of aromatic ring substituant, acidity (HF-SbF5 5:1)
Synthesis of Isatin 3-Oximes from 2-Nitroacetanilides
作者:Timothy Kearney、Philip A. Harris、Arthur Jackson、John A. Joule
DOI:10.1055/s-1992-26223
日期:——
2-Nitroacetanilides, prepared by alkaline hydrolysis of 1-arylamino-1-methylthio-2-nitroethenes, are converted into isatin (1H-indole-2,3-dione) 3-oximes by treatment with concentrated sulfuric acid or trifluoromethanesulfonic acid at room temperature.
Kearney, Timothy; Joule, John A., Heterocycles, 1992, vol. 33, # 2, p. 757 - 762
作者:Kearney, Timothy、Joule, John A.
DOI:——
日期:——
Microwave-assisted synthesis of Nitroketene N,S-Arylaminoacetals
作者:Diego P. Sangi、Arlene G. Corrêa
DOI:10.1590/s0103-50532010000500005
日期:——
In this paper we report the use of microwaves as heat source to promote the synthesis of a series of nitroketene N,S-acetals with good to excellent isolated yields. These compounds are very useful intermediates for synthesizing nitrogen-containing heterocycles.
Dipolar Cycloaddition of Ethyl Isocyanoacetate to 3-Chloro-2-(methylthio)/2-(methylsulfonyl)quinoxalines: Highly Regio- and Chemoselective Synthesis of Substituted Imidazo[1,5-<i>a</i>]quinoxaline-3-carboxylates
作者:G. S. M. Sundaram、B. Singh、C. Venkatesh、H. Ila、H. Junjappa
DOI:10.1021/jo070590k
日期:2007.6.1
An efficient route for regio- and chemoselective synthesis of substituted 3-(carboethoxy)imidazo[1,5-a]quinoxalines and novel diimidazo[1,5-a:5‘,1‘-c]quinoxalines via base-induced cycloaddition of ethyl isocyanoacetate to unsymmetrically substituted 3-chloro-2-(methylthio)/2-(methylsulfonyl)quinoxalines has been reported.
通过碱诱导的环加成反应合成取代的3-(羰基乙氧基)咪唑并[1,5- a ]喹喔啉和新型二咪唑并[1,5- a:5',1'- c ]喹喔啉的区域和化学选择性合成的有效途径据报道,异氰基乙酸乙酯转化为不对称取代的3-氯-2-(甲硫基)/ 2-(甲磺酰基)喹喔啉。