tert-Butanol → HCID 86707733, compound

Participants

Reaction Steps

To a solution of Compound 45a (460 mg, 0.81 mmol) in DCM (5 mL) was added TFA (5 mL) and the reaction mixture stirred for 1 h. The reaction mixture was concentrated under reduced pressure, and the residue was co-evaporated with toluene (3×) and DCM, then dried under high vacuum to give (S)-benzyl 2-amino-3-(5-((6-phenylbenzo[d]thiazol-2-yl)methyl)-1,3,4-oxadiazol-2-yl)propanoate (500 mg, 100% yield) as a yellow solid. LCMS=1.90 min using analytical method (B), 471.0 (M+H). In a separate flask, to a solution of sulfurisocyanatidic chloride (170 mg, 1.2 mmol) in DCM (2 mL) was added 2-methylpropan-2-ol (90 mg, 1.2 mmol) in DCM (2 mL) and the reaction mixture stirred for 20 min. The resulting solution was then added to a mixture of (S)-benzyl 2-amino-3-(5-((6-phenylbenzo[d]thiazol-2-yl)methyl)-1,3,4-oxadiazol-2-yl)propanoate (500 mg, 0.81 mmol) and TEA (0.56 mL, 4.0 mmol) in DCM (5 mL) and the reaction mixture stirred for 3 h. The reaction mixture was concentrated under reduced pressure and the residue was dissolved in EtOAc, washed with 1 N HCl solution and brine, dried (Na2SO4), filtered and concentrated under reduced pressure. The residue was dissolved in DCM (6 mL) and treated with TFA (3 mL) then stirred for 1 h. The mixture was concentrated under reduced pressure, co-evaporated under reduced pressure with toluene and DCM, and the residue purified by silica gel chromatography eluting with 0-10% MeOH/DCM to give Compound 45b (380 mg, 86% yield) as a yellow solid. LCMS=2.00 min using analytical method (B), 550.2 (M+H). 1H NMR (400 MHz, CDCl3) δ 8.15-8.08 (m, 1H), 8.06-8.00 (m, 1H), 7.76-7.70 (m, 1H), 7.66-7.58 (m, 2H), 7.50-7.44 (m, 2H), 7.42-7.27 (m, 7H), 5.65-5.58 (m, 1H), 5.23-5.19 (m, 1H), 5.16-5.09 (m, 2H), 4.73-4.61 (m, 3H), 3.53-3.30 (m, 2H).

Provenance & Evidence