A Transition-Metal-Free and Base-Mediated Carbene Insertion into Sulfur-Sulfur and Selenium-Selenium Bonds: An Easy Access to Thio- and Selenoacetals
作者:Dhanarajan Arunprasath、Govindasamy Sekar
DOI:10.1002/adsc.201600855
日期:2017.2.20
A transition‐metal‐free and base‐mediated carbene insertion across sulfur‐sulfur and selenium‐selenium bonds has been developed by employing N‐tosylhydrazone as a stable and safe carbene precursor. The ylide formation from carbene followed by Stevens rearrangement are considered to be the key steps. This thiol and selenol‐free protocol delivers thioacetals and selenoacetals in good to excellent yields
Synthesis and antimicrobial evaluation of hydrazones derived from 4-methylbenzenesulfonohydrazide in aqueous medium
作者:Sunita Ghiya、Yogesh C. Joshi
DOI:10.1007/s00044-016-1543-9
日期:2016.5
and aromatic carbonyl compounds in the presence of polystyrene sulfonic acid in aqueous medium. The synthesized compounds were characterized by IR, NMR and mass spectra. The compounds have been evaluated for antimycobacterial, antibacterial and antifungal activities.
Sustainable Synthesis of Oximes, Hydrazones, and Thiosemicarbazones under Mild Organocatalyzed Reaction Conditions
作者:Sara Morales、José Luis Aceña、José Luis García Ruano、M. Belén Cid
DOI:10.1021/acs.joc.6b01912
日期:2016.10.21
thiosemicarbazones derived from aromatic and aliphaticaldehydes using equimolar amounts of reagents and green solvents. Experimental simplicity and excellent yields after a simple filtration are the main advantages of the method, being an alternative to those currently available especially for the acyl derivatives, which do not work under uncatalyzed conditions. Its application to the synthesis of acyloximes by
Synthesis of 1H-indazoles from N-tosylhydrazones and nitroaromatic compounds
作者:Zhenxing Liu、Long Wang、Haocheng Tan、Shiyi Zhou、Tianren Fu、Ying Xia、Yan Zhang、Jianbo Wang
DOI:10.1039/c4cc00962b
日期:——
A new method for the synthesis of 1H-indazoles from readily available N-tosylhydrazones and nitroaromatic compounds has been developed. This transformation occurs under transition-metal-free conditions and shows a wide substrate scope. The method has been successfully applied to the formal synthesis of a bioactive compound, WAY-169916.
作者:Ronald Grigg、Marie Dowling、Maurice W. Jordan、Visuvanathar Sridharan、Sunit Thianpatanagul
DOI:10.1016/s0040-4020(01)87793-0
日期:——
Hydrazones of aldehydes and ketones undergo intermolecular cycloaddition to electronegative olefins via azomethine imines, formed by a formal 1,2-prototropic shift, in low to moderate yield on heating in xylene or ethanol. In some instances the reaction is diverted to give products derived (at least formally) from an ene reaction. Similar intramolecular cycloadditions occur with unactivated terminal