Copper-catalyzed cascade click/nucleophilic substitution reaction to access fully substituted triazolyl-organosulfurs
作者:Ming Li、Kun Dong、Yubin Zheng、Wangze Song
DOI:10.1039/c9ob02081k
日期:——
A novel cascade click/nucleophilic substitutionreaction is developed to access 4-heterofunctionalized fully substituted triazolyl-organosulfurs using thiocyanates as both leaving groups and organosulfur precursors. This method features high regioselectivities and board substrate scope. 33 examples are shown to demonstrate the structural diversity through the synthesis of fully substituted triazolyl-organosulfurs
Ruthenium‐Catalyzed Highly Regioselective Azide‐Internal Thiocyanatoalkyne Cycloaddition under Mild Conditions: Experimental and Theoretical Studies
作者:Wangze Song、Ming Li、Kun Dong、Yubin Zheng
DOI:10.1002/adsc.201901014
日期:2019.11.19
azide‐internal thiocyanatoalkyne cycloaddition reaction undermildconditions. This is the first time that fully substituted 5‐thiocyanato‐1,2,3‐triazoles have been prepared and the first time an AAC/nucleophilic substitution cascade reaction have been used to generate various fully substituted triazolyl‐organosulfurs, such as 5‐sulfur‐triazoles and 5‐sulfinylcyanato‐triazoles from common internal thiocyanatoalkyne
A novel hypervalent iodine reagent prepared from o-iodosylbenzoic acid and trifluoromethanesulfonic acid preparation and reactions of alkynyl(o-carboxyphenyl)iodonium triflates
acid (TfOH) (1:2) showed a high reactivity toward aromatic substrates, giving aryl(o-carboxyphenyl)iodoniumtriflates in good to high yields. Treatment of the iodine reagent with 1-trimethylsilylalkynes afforded alkynyliodonium triflates bearing carboxy group in high yields. The alkynyliodonium triflates indicated a high efficiency as a Michael acceptor to nucleophiles and the o-carboxyphenyliodonio
An efficient method to access 2‐triazolyl thio‐/selenopyridines with good to excellent yields by ruthenium(II)‐catalyzedone‐pot [3+2]/[2+2+2] cycloaddition reactions of azides, 1‐alkynyl thio‐/selenocyanates and 1,6‐diynes is reported. This atom‐economical catalytic strategy offers a mild and practical approach to access a variety of such cycloadducts with good to excellect regioselectivities. The