Azido(trimethyl)stannane → HCID 178440122, compound

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Reaction Steps

4 g of 7-n-propyl-5-methyl-8-[(2'-cyano-4-biphenylyl)methyl]-1,2,4-triazolo[4,3-c]pyrimidin-3(2H)-one, prepared in Example 15, are dissolved in 100 ml of toluene. 2.8 g of trimethyltin azide are added and the mixture is heated to reflux for 24 hours. The crystals formed are drained in the heated state and washed with ether, then suspended in 100 ml of tetrahydrofuran. Hydrogen chloride gas is bubbled into the mixture and, after the reactants have passed completely into solution, a precipitate appears. The mixture is left overnight at room temperature and the crystals formed are drained, washed with ether and dissolved in dilute sodium hydroxide solution. This solution is washed with ether, then acidified by bubbling in sulphur dioxide and extracted with chloroform. The organic phase is dried over magnesium sulphate and evaporated under vacuum, and the residue crystallises in an ether/acetone mixture to give 1.5 g of 7-n-propyl-5-methyl-8-{[2'-(5-tetrazolyl)-4-biphenylyl]methyl}-1,2,4-triazolo[4,3-c]pyrimidin-(3(2H)-one in the form of crystals of melting point 248°-249° C.

Provenance & Evidence