71742-42-2Relevant articles and documents
Mesoionic pyrido[1,2-a]pyrimidinones: Discovery of dicloromezotiaz as a lepidoptera insecticide acting on nicotinic acetylcholine receptors1,2
Zhang, Wenming,Holyoke, Caleb W.,Barry, James,Cordova, Daniel,Leighty, Robert M.,Tong, My-Hanh T.,Hughes, Kenneth A.,Lahm, George P.,Pahutski, Thomas F.,Xu, Ming,Briddell, Twyla A.,McCann, Stephen F.,Henry, Yewande T.,Chen, Yuzhong
, p. 911 - 917 (2017/02/10)
A novel class of mesoionic pyrido[1,2-a]pyrimidinones has been discovered with exceptional insecticidal activity controlling a number of insect species. In this communication, we report the part of the optimization program that led to the identification o
3-Aryltetronic acids: Efficient preparation and use as precursors for vulpinic acids
Mallinger, Aurelie,Gall, Thierry Le,Mioskowski, Charles
experimental part, p. 1124 - 1129 (2009/07/11)
3-Aryltetronic acids were prepared in one step by treatment of a mixture of methyl arylacetates and methyl hydroxyacetates with potassium tert-butoxide, via tandem transesterification/Dieckmann condensation. Several mushroom or lichen pigments, vulpinic acids, were synthesized from 3-(4-methoxyphe-nyl) tetronic acid in three steps involving the reaction of the corresponding dianion with an α-ketoester and the dehydration of the tertiary alcohols obtained into mixtures of (E)-and (Z)-alkenes, which were converted under UV irradiation at 254 nm to natural (E)-isomers. Syntheses of pinastric acid, 4,4′-dimethoxyvulpinic acid, and the first synthesis of recently isolated methyl 3′,5′-dichloro-4,4′-di-0-methylatromentate were hence achieved in an efficient manner.
