Epilupinine

Epilupinine is a naturally occurring quinolizidine alkaloid. Epilupinine serves as a key model compound in the study of quinolizidine biosynthesis, chemical ecology, and asymmetric synthesis.

Structure

It is the C-1 epimer of the more common alkaloid lupinine. It is a stereoisomer of a fundamental lupin alkaloid. It possesses a fused bicyclic structure comprising a piperidine and a pyridine ring, with a hydroxymethyl group at the ring junction.
Epilupinins and lupinine themselves are the simplest of a large group of alkaloid metabolites from legumes.

It was first isolated from various species within the plant genus Lupinus. They were synthesized via an intermediate enaminone.
Asymmetric total synthesis of -. So far, 17 asymmetric total syntheses of epilupinine. The total synthesis involved alkylations of N-nosylamide, ozone oxidation, and sequential reactions of the removal of the nosyl group, intramolecular dehydrative condensation, intramolecular Mannich reaction catalyzed by l-proline, and a reduction.
The biosynthetic pathway of 1 is proposed to begin with the dimerization of l-lysine to dialdehyde. The intramolecular dehydrative condensation leading to iminium cation followed by an intramolecular Mannich reaction forms aldehyde. Finally, the aldehyde is reduced.

Studies have reported that 1-epilupinine may have therapeutic potential for improving cognitive function and neuroprotection.
To improve dementia symptoms and neuroinflammation in a mouse model of scopolamine-induced dementia, a model was created using scopolamine hydrobromide, with donepezil used as a positive control. After five days of treatment, cognitive function was assessed using the Morris water maze test. An inflammatory marker array was used to measure inflammatory markers in the prefrontal cortex. The Morris water maze test revealed that the model group receiving scopolamine hydrobromide demonstrated significantly fewer platform crossings and longer latencies, while mice treated with epilupinine at a dose of demonstrated improved performance, a higher number of crossings and reduced latency.