tert-butyl 3-(5-butyl-5-hydroxy-4-(3-(2,2,2-trifluoroacetamido)propyl)-2-(trifluoromethyl)-2,5-dihydrooxazol-2-yl)propanoate

diethyl 2-(2,2,2-trifluoroacetyl)butanedioate

tert-butyl 3-[5-oxo-4-(propan-2-yl)-2-(trifluoromethyl)-2,5-dihydro-1,3-oxazol-2-yl]propanoate

tert-butyl 3-(4-(sec-butyl)-5-oxo-2-(trifluoromethyl)-2,5-dihydrooxazol-2-yl)propanoate

tert-butyl 2-(4-phenyl-5-oxo-2-(trifluoromethyl)-2H-oxazolyl)propionate