N-Alkylation of tosylhydrazones via a metal-free reductive coupling procedure
摘要:
A simple metal-free route for the N-alkylation of tosylhydrazones is described via the NaOMe-promoted reductive coupling of tosylhydrazones under mild conditions. A wide variety of N-alkylated tosylhydrazones were obtained in moderate to good yields. (C) 2012 Elsevier Ltd. All rights reserved.
A highly regio- and stereoselective method was developed for the preparation of N-alkenylpyrazoles and chromenopyrazoles by the reaction of N-tosylhydrazones and salicyl N-tosylhydrazones with alkynes under neat conditions in the presence of La(OTf)3. The present study was found to be efficient and convenient for direct access to N-alkenylpyrazoles and chromenopyrazoles through C–C, C–N, and C–O bond
Hypervalent iodine (III)-mediated oxidation of aryl sulfonylhydrazones: A facile synthesis of N-aroyl-N′-acyl arylsulfonylhydrazides
作者:E. Ramakrishna、Kapil Dev、Saransh Wales Maurya、Ibadur Rahman Siddiqui、Rakesh Maurya
DOI:10.1016/j.tetlet.2016.12.085
日期:2017.2
We have developed a novel and efficient method for the oxidation of aryl sulfonylhydrazones to N-aroyl-N′-acyl arylsulfonylhydrazides, using hypervalentiodine (III) reagent in good yields at room temperature.
A new method for the preparation of tert-butylethers is described starting from aryl aldehyde and ketone tosylhydrazones under Bamford-Stevens reaction conditions (t-BuOK/t-BuOH).