Synthesis of Sulfonated 5-Aminopyrazoles by I<sub>2</sub>
/Benzoyl Peroxide-Mediated Tandem Reaction
作者:Dongping Cheng、Tianpeng Chen、Xiaoliang Xu、Jizhong Yan
DOI:10.1002/adsc.201701201
日期:2018.3.1
The tandem reaction of 3‐morpholinoacrylonitrile with sulfonyl hydrazides mediated by I2/benzoyl peroxide (BPO) is reported, which offers an efficient approach for the synthesis of sulfonated 5‐aminopyrazoles. It can bear a large scope of the substrates, and be used for the synthesis of aromatic, heteroaromatic and aliphatic sulfonated 5‐aminopyrazoles.
Access to azolopyrimidine-6,7-diamines as a valuable “building-blocks” to develop new fused heteroaromatic systems
作者:Denis A. Gazizov、Victor V. Fedotov、Konstantin A. Chistyakov、Evgeny B. Gorbunov、Gennady L. Rusinov、Valery N. Charushin
DOI:10.1016/j.tet.2021.132172
日期:2021.6
A simple and convenient approach for the synthesis of new azolopyrimidine-6,7-diamines has been developed by the method of reductive cleavage of azo-group in series 6-[2-(4-methylphenyl)diazenyl]azolo[1,5-a]pyrimidine-7-amines, which was obtained by the interaction of aminoazoles with [2-(4-methylphenyl)hydrazinylidene]-3-oxo-propionitrile. The proposed approach allows to use a wide range of aminoazoles
通过还原裂解 6-[2-(4-甲基苯基)二氮烯基]唑并[1,5-]系列中的偶氮基团的方法,开发了一种简单方便的合成新型唑并嘧啶-6,7-二胺的方法。a ]嘧啶-7-胺,它是通过氨基唑与[2-(4-甲基苯基)肼基]-3-氧代-丙腈相互作用获得的。所提出的方法允许使用范围广泛的氨基唑作为起始试剂,并且它还通过产品分离和纯化的简单性而与众不同。通过获得唑并[ a ]环化蝶啶的反应证明了所呈现的二胺的合成潜力。
Studies on Heteroaromaticity. XLIV. Reactivities of Benzoyl Cyanide<i>N</i>-Oxide and Some Derivatives Therefrom
ω-Chloroisonitrosoacetophenone was treated with ethylenic and acetylenic dipolarophiles to afford 3-benzoylisoxazolinines and -isoxazoles, respectively. With m-nitrobenzaldoxime or m-nitrobenzonitrile, it yielded 3-benzoyl-5-(m-nitrophenyl)-1,2,4-oxadiazole. The phenylhydrazones of the 3-benzoylisoxazole and -oxodiazole thus produced were converted to the corresponding 1,2,3-triazoles thermally or
Synthesis of enaminones containing diverse N,N-disubstitution via simple transamination: a study with sustainable catalyst-free operation
作者:Yong Gao、Yunyun Liu、Li Wei、Jieping Wan
DOI:10.1007/s11164-017-2946-z
日期:2017.10
Abstract A systematic investigation on the synthesis of β-enaminones containing diverse N,N-disubstitution via the transamination of N,N-dimethyl amino functionalized β-enaminones and secondary amines has been conducted by employing biomass available green solvent ethyl lactate as reaction medium. A class of β-enaminones containing different N,N-disubstitutions have been smoothly synthesized under
Novel rearrangement reactions leading to the formation of 2-piperidinyl-tetrahydroquinolinones were observed to occur in reactions of enaminonitrile with the 1,3-cyclohexanedione derivatives. In contrast, 2-phenyl-3-(piperidin-1-yl)acrylonitrile was observed to react with 5,5-dimethyl-1,3-cyclohexanedione to yield 7,7-dimethyl-3-phenyl-7,8-dihydroquinoline-2,5(1H,6H)-dione. While not participating in reaction with 5,5-dimethyl-1,3-cyclohexanedione, 2-benzoyl-3-(dimethylamino)acrylonitrile reacted with 3-oxo-3-phenylpropanenitrile to yield 2-benzoyl-4-[hydroxy(phenyl)-methylene]pent-2-enedinitrile and 5-benzoyl-6-hydroxy-2-phenylnicotinonitrile. The structure of 2-benzoyl-4-[hydroxy(phenyl)methylene]pent-2-enedinitrile along with other substances prepared in this effort were determined by X-ray crystallographic analysis.