Ethyl orthoformate → HCID 86709285, compound

Participants

Reaction Conditions

Reaction Steps

A solution of 1-[3-fluoro-4-[[(3S)-3-methyl-1,1-dioxo-6-phenyl-thiazinan-2-yl]methyl]phenyl]-N′-hydroxy-piperidine-4-carboxamidine Stereoisomer A (150 mg, 0.32 mmol) in triethyl orthoformate (2 mL) was heated to 100° C. for 1 hour. 2 drops of trifluoroacetic acid were then added and the reaction was stirred at 100° C. for 1 hour. The solution was then concentrated and purified by preparative HPLC to give (3S)-2-[[2-fluoro-4-[4-(1,2,4-oxadiazol-3-yl)-1-piperidyl]phenyl]methyl]-3-methyl-6-phenyl-thiazinane 1,1-dioxide Stereoisomer A (31.8 mg, 21% yield). 1H NMR (400 MHz, DMSO) δ 9.53-9.49 (s, 1H), 7.49-7.43 (m, 2H), 7.43-7.35 (m, 3H), 7.35-7.29 (m, 1H), 6.85-6.79 (m, 1H), 6.77-6.69 (m, 1H), 4.50-4.36 (m, 2H), 4.32-4.23 (m, 1H), 4.15-4.02 (m, 1H), 3.81-3.69 (m, 2H), 3.13-3.01 (m, 1H), 2.97-2.83 (m, 2H), 2.46-2.37 (m, 1H), 2.14-1.97 (m, 3H), 1.89-1.70 (m, 3H), 1.70-1.59 (m, 1H), 1.13-1.05 (d, J=6.8 Hz, 3H); LCMS [M+1]+=485.2.

Provenance & Evidence