Dimethylformamide → 2-(1-Methylpropyl)-3H-1,2,4-triazole-3-one

Participants

Reaction Conditions

Reaction Steps

A mixture of 6.7 g of (+)-(2R,cis)-2-(2,4-difluorophenyl)-2-(1H-1,2,4-triazol-1-yl-methyl)-1,3-dioxolane-4-methanol 4-methylbenzenesulfonate(ester) 4-methyl-benzenesulfonate(salt 1:1) (intermediate (10)), 3.9 g of (+)-(S)-2,4-dihydro-4-[4-[4-(4-hydroxyphenyl)-1-piperazinyl]phenyl]-2-(1-methylpropyl)-3H-1,2,4-triazol-3-one (intermediate (7)), 1.5 g of sodium hydroxide flakes and 100 ml of N,N-dimethylformamide was stirred overnight at 50° C. under a nitrogen atmosphere. After cooling, water was added to the reaction mixture. The precipitate was filtered off and taken up in dichloromethane. The organic layer was dried, filtered and evaporated. The residue was triturated with methanol, yielding 5.6 g (83.2%) of (+)-[2R-[2α,4α,4(S)]]-4-[4-[4-[[2-(2,4-difluorophenyl)-2-(1H-1,2,4-triazol-1-ylmethyl)-1,3-dioxolan-4-yl]methoxy]phenyl]-1-piperazinyl]phenyl]-2,4-dihydro-2-(1-methylpropyl)-3H-1,2,4-triazol-3-one; mp. 182.4° C.; [α]D20=+14.130° (c=1% in methanol) (comp. 8).

Provenance & Evidence