Rearrangement of 3,3-Disubstituted 1-Aryl-4,5-dihydro-5-oxo-3H-1,2,4-triazolium Tetrafluoroborates; Part 2. A Convenient Synthesis of 1,5-Annulated 1,2-Dihydro-2-phenyl-3H-1,2,4-triazol-3-ones
Several aldehyde and ketonephenylhydrazones were electrooxidized in MeOH. Electrooxidation in the presence of KI or tetraethylammonium p-toluenesulfonate as the supporting electrolyte afforded the corresponding methoxy(phenylazo)alkanes. whereas electrooxidation in the presence of KI, NaCN, and HOAc afforded the cyano(phenylazo)alkanes.
几种醛和酮苯腙在 MeOH 中被电氧化。在 KI 或对甲苯磺酸四乙基铵作为支持电解质的情况下进行电氧化,得到相应的甲氧基(苯偶氮)烷烃。而在 KI、NaCN 和 HOAc 存在下的电氧化得到氰基(苯偶氮)烷烃。
NOVEL CARBON–CARBON BOND CLEAVAGE REACTIONS OF α-AZOHYDROPEROXIDES
作者:Masanori Utaka、Yuji Fujita、Akira Takeda
DOI:10.1246/cl.1982.1607
日期:1982.10.5
cyclohexanone phenyl hydrazones, have been found to undergo C(1)–C(2) bondcleavages when treated with acids, bases, or reducing reagents under mild conditions. Thus 6-oxoalkanoic acids and their derivatives have been obtained in good yields from 2-hydroxycyclohexanone derivatives. The 2-hydroxyl group seems to play an important role for the cleavage.
Synthesis of 4-Acylpyrazoles from Saturated Ketones and Hydrazones Featured with Multiple C(sp<sup>3</sup>)–H Bond Functionalization and C–C Bond Cleavage and Reorganization
作者:Miaomiao Tian、Xiaonan Shi、Xinying Zhang、Xuesen Fan
DOI:10.1021/acs.joc.7b01013
日期:2017.7.21
paper, an efficient and convenient one-pot synthesis of diversely substituted 4-acylpyrazole derivativesvia copper-catalyzed one-pot cascade reactions of saturated ketones with hydrazones is reported. Mechanistically, the formation of the title compounds involves the in situ formation of an enone intermediate through the dehydrogenation of a saturated ketone and the [2 + 3] cyclization of the enone