[Isoquinoline alkaloids from Corydalis thyrsiflora prain]

Area of Science:

• Phytochemistry
• Natural Products Chemistry

Context:

• Corydalis thyrsiflora Prain is a traditional herbal medicine utilized in Tibetan practices.
• The study focuses on the chemical constituents of this plant for potential pharmaceutical applications.

Purpose:

• To isolate and identify the isoquinoline alkaloids present in the whole plant of Corydalis thyrsiflora Prain.
• To confirm the chemical structures of the isolated compounds through spectral analysis and comparative data.

Summary:

• Twelve isoquinoline alkaloids were successfully isolated from Corydalis thyrsiflora.
• The identified alkaloids include protopine, dl-tetrahydrocoptisine, l-sinactine, l-cavidine, d-bicuculline, d-corlumine, sibiricine, ochotensine, dihydrosanguinarine, 8-acetonydihydrosanguinarine, d-adlumidine, and fumaramine.
• Structural elucidation was achieved via spectral analysis and comparison with existing literature and authentic standards, with fumaramine's structure further verified through chemical transformation from bicuculline.

Impact:

• Provides a comprehensive phytochemical profile of Corydalis thyrsiflora.
• Contributes to the understanding of the chemical basis for the traditional uses of this Tibetan herbal medicine.
• Offers valuable data for further pharmacological research and potential drug development based on identified alkaloids.