| Modern organic chemistry is developing in the direction of simplicity,efficiency,and environmental protection.In recent years,the exploration of green and efficient new synthetic strategies has become one of the driving forces for the development of modern synthetic organic chemistry.visible light,as a green and renewable energy source with abundant reserves in the world,promotes the photocatalytic synthetic method to meet with the requirements of development requirements of safety,environmental protection,green and high efficiency;on the other hand,electrochemical method has also developed as a new synthetic strategy,which can facilitate the reaction through electron transfer between the electrode and the substrate molecule without additional oxidant.In this paper,a visible-light-promoted construction of C-S bond between bromoalkynes and2,2’-diaminodiaryl disulfides is developed;and functional group transformation of hydrazide is achieved in electrochemical environment,detailed as following:1: A straightforward synthesis of alkynylthioethers via an amino-assisted and visible-light-promoted coupling reaction of bromoalkynes with2,2’-diaminodiaryldisulfides has been developed.The reaction can be accomplished in the absence of transition metals,photocatalysts and additives,providing a wide variety of alkynylthioethers in good yields.The possible mechanism of the reaction was studied by means of controlled experiments.While switching bromoalkynes to aliphatic ketones,a visible-light-induced cascade cyclization is established to afford dihydrobenzothiazoles using pyrylium salt as an effective photocatalyst.2: Hydrazides as substrates to denitrification ammoniation,hydrolysis,alcoholysis and denitrogenation hydrogenation reactions to generate the corresponding products N’-arylformylarylformylhydrazides,carboxylic acids,and carboxylic acid esters and aldehydes under electrochemical conditions without additional catalysts and oxidants.The reaction conditions are mild,the operation is simple,and has a good broad spectrum of substrates. |
