What question did this study set out to answer?

This research aims to develop efficient synthetic methods for complex pharmacophore combinations.

Base‐Promoted Annulation for the Synthesis of Functionalized Isoxazole‐Linked 1,4‐Dihydropyrazolo[4′,3′:5,6]pyrano[2,3‐ b ] Quinolines

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Novel synthesis improves yield in isoxazole-linked quinolines with triethylamine, suggesting advances in enantioselective synthesis.

This research aims to develop efficient synthetic methods for complex pharmacophore combinations.
Synthesis of isoxazole-linked quinolines via base-promoted annulation under reflux conditions.
Used triethylamine as a base in ethyl acetate to promote the reaction.
Implemented a mechanistic process including 1,6-Michael addition and S N Ar route.
Synthesized a series of 33 isoxazole-linked 1,4-dihydropyrazoloquinolines with yields up to 94%.
Accomplished enantioselective synthesis of chiral target compounds using a quinine-derived thiourea catalyst, achieving up to 96% ee.

Lin et al. (2026) studied this question.

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