(Z)-3-(3-(3,5-Bis(trifluoromethyl)phenyl)-1H-1,2,4-triazol-1-yl)acrylic acid (0.3 g, 1 eq.) dissolved in ethylacetate (20 mL) and cooled to −70° C. where tert-butyl-2,6-diazaspiro[3.4]octane-2-carboxylate (0.22 g, 1.2 eq.), T3P (50% in EtOAc) (0.61 mL, 1.2 eq.), followed by DIPEA (0.6 mL, 4 eq) were added. The clear reaction mixture was stirred at −60° C. for 1 h, concentrated under reduced pressure (25° C., 20 mm Hg) to afford the crude product, which was purified by chromatography (3-4% Methanol in DCM) to yield (Z)-tert-butyl 6-(3-(3-(3,5-bis(trifluoromethyl)phenyl)-1H-1,2,4-triazol-1-yl)acryloyl)-2,6-diazaspiro[3.4]octane-2-carboxylate (0.2 g; 43% yield).
