Trimethylsilylacetylene → HCID 15610798, compound

Participants

Reaction Steps

In a mixture of 50 ml of triethylamine and 100 ml of tetrahydrofurane, 8.0 g of the thus obtained 2-heptylthio-6-iodo-5H-1,3,4-thiadiazolo[3,2-a]pyrimidin-5-one was dissolved. To this solution, 0.68 g of bis(triphenylphosphine)palladium(II) chloride and 0.2 g of cuprous iodide were added as catalysts. To this mixture, a solution of 3.9 g of ethynyltrimethylsilane in 20 ml of triethylamine was added dropwise. The mixture was warmed to 60°~70° C. and stirred for 1 hour. Thereafter, further the same amounts as above of the catalysts and ethynyltrimethylsilane were added, and the mixture was stirred at 60°~70° C. for 3 hours. After cooling, the reaction mixture was filtered, and the filtrate was concentrated under reduced pressure. The residue was purified by silica gel column chromatography using an ethyl acetate/toluene mixture as an eluent, and 5.9 g of 2-heptylthio-6-trimethylsilylethynyl-5H-1,3,4-thiadiazolo[3,2-a]pyrimidin-5-one was obtained. Yield 80%.

Provenance & Evidence