The invention discloses a synthesis process of
neotame. The synthesis process comprises the following steps: adding
aspartame into a reaction container, performing water-bath heating to 33-35 DEG C, further adding 3,3-dimethyl
butyraldehyde, heating to 30-60 DEG C, performing heat preservation reaction for 55-70 minutes, then adding a catalyst at the temperature, and introducing
hydrogen for reacting for 14-16 hours; after the end of the reaction, filtering the catalyst to get filtrate, further washing the catalyst with an appropriate amount of
methanol, merging the filtrate and washing liquid, performing
vacuum distillation at the temperature of 40-50 DEG C, distilling obtained solids, further adding water, cooling, crystallizing, filtering at the temperature of less than 5 DEG C,
drying and crushing to get a crude product; and adding 15-40%
ethanol into the crude product,
drying and crushing to get a final
neotame finished product. According to the synthesis process of the
neotame, the yields of the crude product and the finished product are greatly improved, the yield of the crude product can be improved from the current 70-72% to above 90%, the yield of the finished product can be improved from the current about 65% to above 80%, and the quality of the finished product has no difference in comparison with that of the finished product synthesized by the prior art.