Carbamate-Modified Pyrido[1,2-a]pyrimidinones: Design and Synthesis of Insecticides with High Efficacy and Low Bee Toxicity.
Megoura crassicauda, a sap-feeder on legumes, remains a persistent threat, yet current control depends largely on neonicotinoids that pose serious risks to beneficial pollinators. We herein describe a set of new pyrido[1,2-a]pyrimidinone derivatives bearing a carbamate moiety attached via a methylene spacer at the 2-po...