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Abstract
Starting from 3-cyano-4,6-distyrylpyridin-2(1H)-thione (1), the compound N-(4-chlorophenyl)-2-((3-cyano-4,6-distyrylpyridin-2-yl)thio)acetamide (2) was prepared. Compound (2) underwent cyclization upon heating in ethanolic sodium ethoxide solution to give the corresponding cyclized form 3-amino-N-(4-chlorophenyl)-4,6-distyrylthieno[2,3-b]pyridine-2-carboxamide (3). The elemental analyses and spectroscopic data of compounds (2) and (3) are in agreement with their proposed structures. Their insecticidal activity against cowpea aphid, Aphis craccivora Koch, was studied. The results of insecticidal activity for compounds (2) and (3) against the nymphs and the adults of the tested insects exhibited that compounds (2) and (3) have a higher insecticidal activity than that of acetamiprid, a reference insecticide, after 24 h of treatment.
Highlights
The chemistry of functionalised pyridine compounds has been extensively developed, which is reflected in many papers that have been published.[1-8]
This is associated with both a theoretical interest in this class of organic compounds and a very broad spectrum of the practical uses of pyridine derivatives
As an Expanding our work that focused on the synthesis of heterocyclic compounds and continuing our investigations on the chemistry of some pyridine derivatives neonicotinoid analogs,[1-6] we report the synthesis of two new heterocyclic compounds containing pyridine ring
Summary
The chemistry of functionalised pyridine compounds has been extensively developed, which is reflected in many papers that have been published.[1-8]. This is associated with both a theoretical interest in this class of organic compounds and a very broad spectrum of the practical uses of pyridine derivatives. As an Expanding our work that focused on the synthesis of heterocyclic compounds and continuing our investigations on the chemistry of some pyridine derivatives neonicotinoid analogs,[1-6] we report the synthesis of two new heterocyclic compounds containing pyridine ring and screened their insecticidal activity against cowpea aphid, Aphis craccivora Koch (Homoptera: Aphididae) in the presence of acetamiprid insecticide as a reference
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