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Pyrrolizidine alkaloids (PAs), sometimes referred to as necine bases, are a group of naturally occurring alkaloids based on the structure of pyrrolizidine. Their use dates back centuries and is intertwined with the discovery, understanding, and eventual recognition of their toxicity on humans and animals.
Pyrrolizidine is a heterocyclic organic compound. Formally, it is a saturated derivative of pyrrolizine. Pyrrolizidine forms the central chemical structure of a variety of alkaloids known collectively as pyrrolizidine alkaloids. [1] It is one of five classes of iminosugars. These are often synthesized from a carbohydrate. [2]
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Riddelliine is a naturally occurring pyrrolizidine alkaloid, a class of compounds occurring in rangeland plants of the genera Crotalaria, Amsinckia, and Senecio. [5] It consists of a macrocyclic diester of retronecine (an unsaturated alcohol) and riddelliic acid (an oxygenated, branched, dicarboxylic acid). [5]
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Retronecine is a pyrrolizidine alkaloid found in a variety of plants in the genera Senecio and Crotalaria, and the family Boraginaceae. It is the most common central core for other pyrrolizidine alkaloids. [1]
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