tert-butyl 3-{[2-(4-fluorophenyl)ethyl]amino}propanoate

tert-butyl 3-{[3-(diethylamino)propyl]amino}propanoate

ethyl 3-{[2-(piperidin-1-yl)ethyl]amino}propanoate

ethyl 3-(pentylamino)propanoate

ethyl 3-{[(4-methoxyphenyl)methyl]amino}propanoate

ethyl 3-{[(4-chlorophenyl)methyl]amino}propanoate

tert-butyl 3-[(2-ethoxyethyl)amino]-2-methylpropanoate

tert-butyl 2-methyl-3-{[2-(piperidin-1-yl)ethyl]amino}propanoate

tert-butyl 2-methyl-3-{[(pyridin-4-yl)methyl]amino}propanoate

tert-butyl 2-methyl-3-{[(oxolan-2-yl)methyl]amino}propanoate

tert-butyl 3-[(2,2-diethoxyethyl)amino]-2-methylpropanoate