O’donnell, M. J., Wojciechowski, K., Ghosez, L., Navarro, M., Sainte, F., & Antoine, J.-P. (1984). Alkylation of Protected Alpha-amino-acid Derivatives in the Presence of Potassium Carbonate. Synthesis : journal of synthetic organic chemistry, 4, 313-315. https://doi.org/10.1055/s-1984-30822 (Original work published 1984)