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
Efficient solvent-free synthesis of thiazolidin-4-ones from phenylhydrazine and 2,4-dinitrophenylhydrazine
作者:Patrícia D. Neuenfeldt、Bruna B. Drawanz、Geonir M. Siqueira、Claudia R.B. Gomes、Solange M.S.V. Wardell、Alex F.C. Flores、Wilson Cunico
DOI:10.1016/j.tetlet.2010.04.026
日期:2010.6
An efficient solvent-free synthesis of thiazolidinones from reaction of mercaptoacetic acid, aldehydes (benzaldehyde and valeraldehyde) or ketones (cyclopentanone and cyclohexanone), and hydrazines (phenylhydrazine and 2,4-dinitrophenylhydrazine) is reported. The compounds were generally characterized by spectroscopic techniques and specifically for 2-cyclohexanyl-3-(N-phenyl)-1,3-thiazolidin-4-one
One-Pot Synthesis of Indoles from Ketones and Hydrazines under Mild Reaction Conditions
作者:Okiko Miyata、Yasuo Kimura、Takeaki Naito
DOI:10.1055/s-2001-16756
日期:——
A facile one-pot method is presented for the synthesis of indoles via condensation of ketone with hydrazine followed by acylation and rearrangement. This convenient synthetic method provides an easy and simple access to indoles.
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。
1,3-Dipolar Cycloaddition of Hydrazones with α-Oxo-ketenes: A Three-Component Stereoselective Entry to Pyrazolidinones and an Original Class of Spirooxindoles
prepared efficiently by a three-component reaction involving a 1,3-dipolarcycloaddition of azomethineimines obtained from hydrazones with α-oxo-ketene dipolarophiles generated in situ. The reaction allows the creation of four covalent bonds and two contiguous chiral quaternary centers with excellent diastereoselectivity in a single catalyst/additive-free, highly atom-economical transformation. From a
作者:W. Russell Bowman、Peter T. Stephenson、Nicholas K. Terrett、Adrian R. Young
DOI:10.1016/0040-4020(95)00412-2
日期:1995.7
Radical cyclisation of sp3 carbon-centred radicals onto imines and hydrazones provides a new method for the synthesis of 5- and 6-membered ring nitrogen heterocycles. Cyclisation onto the electrophilic carbon of the C=N group and 5-exo stereoelectronic selectivity are the dominating mechanistic parameters. The C-centred radical intermediates were generated from benzeneselenyl precursors using Bu3SnH