Straightforward Reductive Esterification of Carbonyl Compounds with Carboxylic Acids through Tosylhydrazone Intermediates
作者:Angel-Humberto García-Muñoz、María Tomás-Gamasa、M. Carmen Pérez-Aguilar、Erick Cuevas-Yañez、Carlos Valdés
DOI:10.1002/ejoc.201200647
日期:2012.7
The reaction of carboxylicacids with tosylhydrazones in basic media gives rise to the corresponding esters through an O–H insertion reaction in the in situ generated diazo compound. The process is operationally very simple, catalyst free, and very general with regard to the structure of both coupling partners. In particular, the esterification can be accomplished by employing tosylhydrazones derived
One-pot synthesis of S-alkyl dithiocarbamates via the reaction of N-tosylhydrazones, carbon disulfide and amines
作者:Qiang Sha、Yun-Yang Wei
DOI:10.1039/c3ob40745d
日期:——
A new, convenient and efficient transition metal-free synthesis of S-alkyl dithiocarbamates through one-pot reaction of N-tosylhydrazones, carbon disulfide and amines is reported. Tosylhydrazones derived from various aromatic and aliphatic ketones or aldehydes were tested and gave dithiocarbamates in good to excellent yields. The tosylhydrazones can be generated in situ without isolation, which provides
Aluminum Chloride Promoted Hantzsch Reaction of N-Tosylhydrazones
作者:Meng Tang、Hu Wang
DOI:10.1055/s-0036-1588496
日期:2017.11
Abstract An aluminum chloride promoted Hantzsch reaction of N-tosylhydrazones has been developed. The reaction is general for a wide range of N-tosylhydrazones, and a series of 1,4-dihydropyridines (1,4-DHPs) were prepared in moderate to excellent yields. An aluminum chloride promoted Hantzsch reaction of N-tosylhydrazones has been developed. The reaction is general for a wide range of N-tosylhydrazones
Silver(I)-Catalyzed Tandem 1,3-Acyloxy Migration/Mannich-type Addition/Elimination of the Sulfonyl Group of N-Sulfonylhydrazone-propargylic Esters to 5,6-Dihydropyridazin-4-one Derivatives
作者:Zhen Zhang、Min Shi
DOI:10.1002/chem.201103404
日期:2012.3.19
The addition of nucleophiles to CN bonds offers a highly efficient synthetic strategy for accessing nitrogen‐containing molecules.1 Among the well‐developed addition reactions, such as the highly efficient Mannich reaction, various CH bond‐activated compounds including carboxylic acid derivatives, nitroalkanes, and terminal alkynes have been applied as nucleophiles to achieve different classes of
Copper(I)-Catalyzed Wittig Olefination Reactions of<i>N</i>-Tosylhydrazones with Trifluoromethylketones
作者:Qiang Sha、Yunyang Wei
DOI:10.1002/cctc.201300583
日期:2014.1
iodide‐catalyzed Wittig olefination reactions of N‐tosylhydrazones with trifluoromethylketones are reported. This procedure provides an efficient method for the synthesis of various trifluoromethyl‐substituted alkenes in moderate to good yields (up to 89 % yield) and good stereoselectivity (up to 93 % E‐selectivity). To the best of our knowledge, it is the first report of a Wittig reaction of N‐tosylhydrazones