An improved synthesis of (S)-aspartyl-(7,7-dimethylnorborn-2R-yl)-(S)-alanine methyl ester, a new high intensity artificial sweetener
作者:Yoshifumi Yuasa、Toru Watanabe、Akira Nagakura、Haruki Tsuruta、George A. King、James G. Sweeny、Guillermo A. Iacobucci
DOI:10.1016/s0040-4020(01)88486-6
日期:1992.1
(S)-Aspartyl-(7,7-dimenthylnorborn-2R-yl)-(S)-alanine methyl ester (1) was synthesized in nine steps from (+)-α-fenchyl alcohol (3) as a chiral synthon. Crucial steps for controlling the side-chain stereochemistry of 1, required for the manifestation of sweetness, were the catalytic hydroformylation of the olefin 4 and the enzymatic resolution of the racemic amino acid 9 using acylase I.
(S)-天冬氨酰-(7,7-二薄荷基降冰片烯-2R-基)-(S)-丙氨酸甲酯(1)由(+)-α-苯甲醇(3)作为手性合成子以九步合成。表现甜度所需的控制1的侧链立体化学的关键步骤是烯烃4的催化加氢甲酰化和使用酰基转移酶I的外消旋氨基酸9的酶促拆分。