Enzymatic- and Iridium-Catalyzed Asymmetric Synthesis of a Benzothiazepinylphosphonate Bile Acid Transporter Inhibitor
作者:David J. Cowan、Jon L. Collins、Mark B. Mitchell、John A. Ray、Peter W. Sutton、Amy A. Sarjeant、Eric E. Boros
DOI:10.1021/jo402311e
日期:2013.12.20
A synthesis of the benzothiazepine phosphonic acid 3, employing both enzymatic and transition metal catalysis, is described. The quaternary chiral center of 3 was obtained by resolution of ethyl (2-ethyl)norleucinate (4) with porcine liver esterase (PLE) immobilized on Sepabeads. The resulting (R)-amino acid (5) was converted in two steps to aminosulfate 7, which was used for construction of the benzothiazepine