Electrochemical oxidation of ketone acylhydrazones and their hydrogen cyanide adducts in sodium cyanide-methanol. Transformation of ketones to nitriles
Synthesis of 9-Acetyl-8,9-diaza-1-phosphabicyclo[4.3.0]nona-3,7-dienes by Regioselective Diels-Alder Reaction of 2<i>H</i>-1,2,3-Diazaphospholes with Isoprene
作者:Ruyu Chen、Baozhong Cai、Guowei Li
DOI:10.1055/s-1991-26573
日期:——
2H-1,2,3-Diazaphospholes, prepared from various hydrazones and phosphorus trichloride in the presence of triethylamine, react with isoprene to give highly regioselective Diels-Alder products in good yield.
Yandovskii,V.N., Journal of Organic Chemistry USSR (English Translation), 1976, vol. 12, p. 1102 - 1104
作者:Yandovskii,V.N.
DOI:——
日期:——
Electrooxidative cyclization of N-acylhydrazones of aldehydes and ketones to .DELTA.3-1,3,4-oxadiazolines and 1,3,4-oxadiazoles
作者:Toshiro Chiba、Mitsuhiro Okimoto
DOI:10.1021/jo00031a014
日期:1992.2
The electrolytic oxidation of ketone N-acylhydrazones (1) in methanolic sodium acetate induced their intramolecular cyclization to the corresponding 2-methoxy-DELTA(3)-1,3,4-oxadiazolines 3. The thermal stability of a given oxadiazoline and what products were formed by its thermal decomposition was found to depend on the natures of the substituents at C-2. Thus, 2-methoxy-2-phenyloxadiazolines preferentially yielded oxiranes 5, whereas 2-alkyl-2-methoxyoxadiazolines preferentially gave enol ethers 6. 2,2-Dimethoxyoxadiazolines decomposed to the parent ketones and many unidentified products. The electrolytic oxidation of aldehyde N-acylhydrazones 2 gave 2,5-disubstituted 1,3,4-oxadiazoles 4. The oxidative cyclization of the N-benzoylhydrazones of aliphatic aldehydes gave especially high yields of the corresponding heterocycles.
Photolysis of 2-alkoxy-.DELTA.3-1,3,4-oxadiazolines. A new route to diazoalkanes
作者:Michael W. Majchrzak、Michel Bekhazi、Irene Tse-Sheepy、John Warkentin