Asymmetric Synthesis of a Glucagon Receptor Antagonist via Friedel–Crafts Alkylation of Indole with Chiral α-Phenyl Benzyl Cation
作者:John Y. L. Chung、Dietrich Steinhuebel、Shane W. Krska、Fred W. Hartner、Chaoxian Cai、Jonathan Rosen、Danny E. Mancheno、Tao Pei、Lisa DiMichele、Richard G. Ball、Cheng-yi Chen、Lushi Tan、Antony D. Alorati、Sarah E. Brewer、Jeremy P. Scott
DOI:10.1021/op300249q
日期:2012.11.16
hydrogenation via dynamic kinetic resolution, and an anti-selective Friedel–Crafts alkylation of a fluoro-indole with a chiral α-phenyl benzyl cation. We also developed two new efficient syntheses of the fluoro-indole, including an unusual Larock-type indole synthesis and a Sugasawa-heteroannulation route. The described convergent synthesis was used to prepare drug substance in 52% overall yield and 99%
描述了用于治疗2型糖尿病的胰高血糖素受体拮抗剂药物候选物的实用不对称合成的开发。该拮抗剂由被丙基和三个包括氟吲哚的芳基取代的1,1,2,2-四取代的乙烷核组成。构造乙烷核心和两个立体生成中心的关键步骤涉及酮芳基化,通过动态动力学拆分的不对称氢化和抗选择性的Friedel-Crafts用手性α-苯基苄基阳离子进行氟吲哚的烷基化。我们还开发了氟吲哚的两种新的高效合成方法,包括一种不寻常的Larock型吲哚合成和Sugasawa-异环化途径。所描述的收敛合成用于制备药物,其总产率为52%,ee为99%ee(以千克为单位)。