Enantioselective Synthesis of the PPARα Agonist (<i>R</i>)-K-13675 via (<i>S</i>)-2-Hydroxybutyrolactone
作者:Yukiyoshi Yamazaki、Takaaki Araki、Minoru Koura、Kimiyuki Shibuya
DOI:10.1055/s-2008-1032123
日期:——
Enantioselective synthesis of enantiomerically pure PPARα agonist (R)-K-13675 can be achieved starting from (S)-2-hydroxybutyrolactone. An important intermediate, 2-(aryloxy)butyrolactone, was prepared by reaction of the phenol with (S)-2-hydroxybutyrolactone in excellent yield without loss of enantiomeric purity using the Mitsunobu reaction, followed by conversion into the 2-(aryloxy)butanoic acid via the 2-(aryloxy)-4-iodobutanoate by cleavage of the lactone on exposure to iodotrimethylsilane, followed by hydrogenolysis and hydrolysis.
从(S)-2-羟基丁内酯出发,可以实现手性纯PPARα激动剂(R)-K-13675的对映选择性合成。重要中间体2-(芳氧基)丁内酯是通过米氏反应将酚与(S)-2-羟基丁内酯反应制备的,产率高且不损失对映纯度,随后通过2-(芳氧基)-4-碘丁酸酯的裂解、氢解脱保护和水解转化为2-(芳氧基)丁酸。