Methyl triflate → Methyl N-(3-chloro-4-fluorophenyl)-4-[(triisopropylsilyl)oxy]methyl-1,2,5-oxadiazole-3-carbimidothioate

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Reaction Steps

To a solution of N-(3-chloro-4-fluorophenyl)-4-[(triisopropylsilyl)oxy]methyl-1,2,5-oxadiazole-3-carbothioamide (3.3 g, 7.4 mmol) in anhydrous DCM (148 mL) under N2 was added N,N-diisopropylethylamine (DIPEA) (1.4 mL). Methyl trifluoromethanesulfonate (900 μL, 8.2 mmol) was then added dropwise and stirred for 2 hrs. The reaction was stripped to dryness and purified on a 330 g silica ISCO cartridge, eluting with 25% EtOAc/hexane to yield the desired product as a yellow oil that solidified upon standing. (2.97 g, 87%). 1H NMR (400 MHz, DMSO-d6) δ: 11.32 (s, 1H), 8.01 (dd, J=7.1, 2.7 Hz, 1H), 7.45 (dd, J=9.5, 9.5 Hz, 1H), 7.67 (m, 1H), 4.4 (s=3H), 5.13 (s, 2H), 1.1 (m, 3H); 0.99 (m, 18H); MF═C20H29ClFN3O2SSi; LCMS calculated for C20H30ClFN3O2SSi(M+H)+: m/z=458.150.

Provenance & Evidence