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A multistep gram-scale synthesis of (S)-ethyl 2-(tert-butoxycarbonylamino)-3-(2-iodo-4,5-methylenedioxyphenyl)propanoate (2) has been developed. The title compound was prepared starting from commercially available l-DOPA which was O- and N-protected before undergoing iodination by CF3CO2Ag/I2. The structure of the target compound was confirmed using IR, 1H-NMR, 13C-NMR, 2D (COSY, HSQC) NMR spectroscopy, as well as ESI-MS and HRMS.

(S)-Ethyl 2-(tert-butoxycarbonylamino)-3-(2-iodo-4,5-methylenedioxyphenyl)propanoate