43084-48-6

Upstream product

• 315239-12-4 8-Methylene-2,3-tetramethylene-7,8-dihydro-4H-thiazolo[3,2-a]thieno[3,2-e]pyrimidin-4-one 
• 53162-03-1 Potassium; 4-oxo-3,4,5,6,7,8-hexahydro-benzo[4,5]thieno[2,3-d]pyrimidine-2-thiolate 
• 179041-03-3 2-Allylthio-5,6-tetramethylenethieno[2,3-d]pyrimidin-4(3H)-one 

Relevant academic research and scientific papers

Synthesis of fused thiazolothienopyrimidines

Cyclization of 2-allylthio- and 2-(2-propynylthio)thieno[2,3-d]pyrimidin-4(3H)-ones under the action of bromine, iodine, and concentrated sulfuric acid yields thiazolo[3,2-a]thieno[2,3-d]pyrimidin-5-one or thiazolo[3,2-a]thieno[2,3-e]pyrimidin-4-one derivatives, depending on the electrophile nature.