科研之友
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摘要
An efficient asymmetric synthesis of a unique sulfenylated prostaglandin DP receptor antagonist candidate is described. The synthesis is characterized by a novel intramolecular Friedel-Crafts cyclization of an imino-pyrrole to prepare the azaindole core. Other key steps include a highly selective Horner-Wadsworth-Emmons olefination of a tricyclic ketone intermediate and subsequent catalytic asymmetric hydrogenation of a trisubstituted alpha,beta-unsaturated ester to install the chirogenic center. Finally, a new indole sulfenylation protocol was developed to install the aromatic thioether functionality in good yield.
- 出版日期2010-8
