合成路线1

The synthesis of [14C]-labeled Sch-42427 labeled in two different positions, i.e., threo-2(R)-(2,4-difluorophenyl)-3(R)-(methylsulfonyl)-1-(1H-1,2,4-triaz ol-1-yl)[1-14C]-butan-2-ol and threo-2(R)-(2,4-difluorophenyl)-3(R)-[[14C]-methylsulfonyl]-1-(1H-1,2,4-triazol-1-yl)butan-2-ol, has been reported: The condensation of 2,4-difluoro-alpha-(tetrahydroypranyloxy)propiophenone (I) with [14C]-trimethylsulfoxonium iodide by means of NaH in DMSO yields the labeled epoxide (II), which is condensed with sodium 1,2,4-triazole (III) in hot DMF yielding 2-(2,4-difluorophenyl)-3-(tetrahydropyranyloxy)-1-(1,2,4-triazol-1-yl)b utan-2-ol (IV). The acidic hydrolysis of (IV) affords the diol (V), which is cyclized to the epoxide (VI) with triethylamine and NaOH. Ring opening of (VI) with sodium methylmercaptane in methanol gives the thio ether (VII), which is finally oxidized with peracetic acid in dichloromethane (scheme 14695202a).