Simple, High-Yield Synthesis of Unsymmetrically Functionalized Bishydrazone and α-Azinohydrazone Derivatives by Reaction of Alkoxy- and Aminocarbonylazoalkenes with Tosylhydrzones
作者:Orazio A. Attanasi、Stefania Santeusanio、Franco Serra-Zanetti
DOI:10.1055/s-1994-25478
日期:——
The reaction of alkoxy- or aminocarbonylazoalkenes with tosylhydrazones, in the presence of sodium hydride in a catalytic amount, leads to unsymmetrically functionalized bishydrazones that are easily converted into related α-azinohydrazones.
作者:Donald McAusland、Sangwon Seo、Didier G. Pintori、Jonathan Finlayson、Michael F. Greaney
DOI:10.1021/ol201413r
日期:2011.7.15
A new approach to the Fischer-indole synthesis is reported that uses the reactive intermediate benzyne. The addition of N-tosyl hydrazones to arynes, generated through fluoride activation of 2-(trimethylsilyl)phenyl triflate precursors, leads to efficient N-arylation. Addition of a Lewis acid to the same reaction pot then affords N-tosylindole products via Fischer cyclization.
Copper-catalyzed direct cross-coupling of 1,3,4-oxadiazoles with N-tosylhydrazones: efficient synthesis of benzylated 1,3,4-oxadiazoles
作者:N. Salvanna、Gandolla Chinna Reddy、Bethapudi Rama Rao、Biswanath Das
DOI:10.1039/c3ra42791a
日期:——
The first copper catalyzed direct C–H benzylation of 1,3,4-oxadiazoles using N-tosylhydrazones has efficiently been accomplished. Several substituted oxadiazoles have been prepared in high yields (80–89%) in 3 h.
A visible-light-driven and room temperature photo-Wolff-Kischner reaction of sulfur ylides and N-tosylhydrazones has been developed for the first time to provide modular access to alkene synthesis. The high functional group tolerance and broad substrate scope were demonstrated by more than 60 examples. Both E- and Z-olefinic stereochemistry in the products could be controlled with excellent stereoselectivity
Abstract Tosylhydrazones can be rapidly converted into corresponding carbonyl compounds in good to excellent yields with thallium trinitrate (TTN) under mild conditions.