It was found that phosphinimidic isocyanates based on 3-, 4-, and 5-aminopyrazoles could undergo intramolecular heterocyclization to yield previously unknown pyrazolo[1,3,2]diazaphosphorin-4-ones containing an endocyclic PN double bond. It was shown that phosphinimidic isocyanate based on 4...
Pyrazolo[1,5- a ]pyrimidines, pyrazoles, and thieno[2,3- b ]pyridine were synthesized from sodium salt of 5-benzofuran-2-yl-3-hydroxypropenone and the appr... AO Abdelhamid - 《Journal of Heterocyclic Chemistry》 被引量: 25发表: 2010年 Synthesis of new 3-(pyridin-6-yl)pyrazolo[1...
本文进一步报道利用TPC 进行 ~ ~ 三芳基吡唑类化合物合成的新方法.1实验部分1.1仪器与试剂显微熔点测定仪(温度未作校正D~BRUKEACF 00核磁共振仪(C Cl 为溶剂~TMS为内标D~NicoletFTIR 型红外光谱仪(KBr压片D~双聚焦VG ZAB MS有机质谱仪~Perkin Elmer240C型元素分析仪.查耳酮(1a 1hD和吡唑啉( aD参照文献[ ...
[4,5-b]quinoxaline derivatives 5–14 via the reaction with 2-chlorobenzaldehyde, 2-chlorocyclohex-1-enecarbaldehyde, 2-chlorobenzoic acid, 2,4-dichlorobenzoic acid, 5-chloro-3-methyl-1-phenyl-1H-pyrazole-4-carbaldehyde, 2-chloro-4,6-dimethylnicotinonitrile, α,β-unsaturated ketones and iso...
Regioselective synthesis of polysubstituted 3,3′-bi-1H-pyrazole derivatives via 1,3-dipolar cycloaddition reactions N,N′-Diarylbisnitrile imides 2 add regioselectively to α-(benzothiazol-2-yl)cinnamonitriles 3 and α-(1-methylbenzimidazol-2-yl)cinnamonitriles 7 to yiel... Ahmad,M.,Farag,...
摘要: Intramolecular cycloadditions of suitably functionalised nitrilimines have been exploited to prepare a number of crown azaethers having a medium or large ring annulated to pyrazole unit(s).关键词: multi‐membered O,N,S‐heterocycles (with at least 2 different heteroatoms) ...
3-(Fluoroalkyl)pyrazoles 3 have been synthesized in excellent yields by reaction of various fluoroalkyl aldehydes with NH2NH2·HOAc under mild conditions. It appears that the reaction involves the formation of a hydrazone intermediate, followed by elimination of hydrogen halide and intramolecular nucleo...
Volume 38, Issue 1, pages 193–197, January/February 2001Additional Information How to Cite Khan, M. A., Ellis, G. P. and Pagotto, M. C. (2001), Pyranopyrazoles III synthesis of 1H-pyrano[2,3-c]pyrazol-4-ones. J. Heterocyclic Chem., 38: 193–197. doi: 10.1002/jhet.5570380129...
3,4-Di-O-acetyl-2-deoxy-2-nitroso-α-D-xylo-pentopyranosyl chloride (2) reacts with pyrazole to afford 1-[3,4-di-O-acetyl-2-deoxy-2-(Z)-hydroxyimino-α- (3) and β-D-threo-pentopyranosyl]pyrazole (4). The products of condensation were modified at C-2 or C-3 to give ...
ChemInform Abstract: One-Pot Synthesis of 1,3,5-Triarylpyrazoles.pyrazole derivativesring opening reactionsring closure reactionsNo abstract is available for this article.doi:10.1002/chin.201345124Huang, ShufangYing, HuazhouHu, YongzhouJohn Wiley & Sons, Ltd.Cheminform...