Regiocontrolled Synthesis of Ring-Fused Thieno[2,3-c]pyrazoles through 1,3-Dipolar Cycloaddition of Nitrile Imines with Sulfur-Based Acetylenes
作者:Jay Zumbar Chandanshive、Bianca Flavia Bonini、Denis Gentili、Mariafrancesca Fochi、Luca Bernardi、Mauro Comes Franchini
DOI:10.1002/ejoc.201001048
日期:2010.11
1,3-Dipolarcycloadditions of C-carboxymethyl-N-arylnitrile imines with substituted acetylenes bearing thiol or sulfone groups were studied. The sulfur controls the regiochemistry of the reaction, and this protocol was applied to the synthesis of ring-fused thieno[2,3-c]pyrazoles.
In Situ Activation of Disulfides for Multicomponent Reactions with Isocyanides and a Broad Range of Nucleophiles
作者:Xiaofang Lei、Yuanyuan Wang、Erkang Fan、Zhihua Sun
DOI:10.1021/acs.orglett.9b00275
日期:2019.3.1
Activation of disulfides with N-halogen succinimide in the presence of TEMPO allows insertion reaction by an isocyanide, the product of which can further accept a wide range of nucleophiles for the generation of isothioureas and related molecular moieties. This new procedure overcomes previous methods that accept essentially only aryl amines as the third nucleophilic component. The diverse nucleophiles