アリターム

来歴Alitame, L-α-aspartyl-D-alanine N-(2,2,4,4-tetra methylthietan-3-yl)amide (5), was developed by Pfizer, but is owned by Danisco now. In 1986, Pfizer filed a food additive petition with the FDA. As of 2006, it was still pending. Alitame was approved for use as a sweetener by Australia in 1993, by China, Mexico, and New Zealand in 1994, by Indonesia in 1995, and by Colombia in 1996.

使用Alitame is a dipeptide amide derivative of aspartic acid used as an artificial sweetener. Alitame is about ten times sweeter than Aspartame (A790015) with a half life about twice as long.

Alitame may be synthesized by a number of routes.For example, 3-(D-alaninamido)-2,2,4,4-tetramethylthietane is dissolved in water and L-aspartic acid N-thiocarboxyanhydride is then added in portions with vigorous stirring, maintaining the pH of 8.5–9.5. The pH is then adjusted to 5.5 and p-toluenesulfonic acid monohydrate is added over a period of one hour. The precipitated crystalline p-toluenesulfonate salt is collected by filtration. To obtain alitame from its salt, a mixture of Amberlite LA-1 (liquid anion exchange resin), dichloromethane, deionized water, and the salt is stirred for one hour, resulting in two clear layers. The aqueous layer is treated with carbon, clarified by filtration, and cooled to crystallize alitame. Alternatively, tetramethylthietane amine is condensed with anNprotected form of D-alanine to give alanyl amide. This is then coupled to a protected analogue of L-aspartic acid to give a crude form of alitame. The crude product is then purified.