boron tribromide to give 3-(3-pyridyl)-3-thiolene-2-one, which only was stable in ether solution at −20°. The attempted demethylation of 2-methoxy-3-(2-pyridyl)thiophene with trimethylsilane chloride/sodium iodide in refluxing acetonitrile led to a dimer. Demethylation of the 2-methoxy-3-pyridylthiophenes with dibenzyl diselenide and sodium borohydride gave 3-pyridylthiophan-2-ones.
Substituted thienopyrans as antihypertensive agents
申请人:Ortho Pharmaceutical Corporation
公开号:US05284857A1
公开(公告)日:1994-02-08
Substituted thienopyrans and processes for preparing the thienopyrans are disclosed. The thienopyrans are useful as antihypertensive agents; antianginals are peripheral antivasoconstrictive agents.