Recent Heterocyclic Compounds from (1,3‐Dioxo‐2,3‐dihydro‐1H‐inden‐2‐ylidene)propanedinitrile

Abstract

This review summarizes the literatures dealing with the synthesis of some important nitrogen or nitrogen/sulfur heterocyclic, spiroheterocyclic, and fused heterocyclic compounds.

An Update of the Use of Thiocarbohydrazides and Thiosemicarbazides in the Preparation of Heterocycles and Their Biological Importance

“…The mechanism was described as due to nucleophilic attacked of 54a–d , j to the C═C double bond of 44 followed by elimination of a molecule of malononitrile to form first intermediate 203a–e (Scheme ). Then intramolecular nucleophilic attack of NH to the carbonyl group to give second intermediate 204a–e was followed by elimination of H 2 O to provide thioxoindenotriazines 205a–e (Scheme ) .…”