In general, if the atoms that make up the ring contain heteroatoms, such rings become heterocycles, and organic compounds containing heterocycles are called heterocyclic compounds. An article called Hydroxy- and amino-substituted piperidinecarboxylic acids as γ-aminobutyric acid agonists and uptake inhibitors, published in 1982, which mentions a compound: 27828-71-3, Name is 5-Hydroxynicotinic acid, Molecular C6H5NO3, Reference of 5-Hydroxynicotinic acid.
The syntheses of (3RS,4RS)-4-hydroxypiperidine-3-carboxylic acid, (3RS,5SR-5-hydroxypiperidine-3-carboxylic acid, (3RS,4SR)-4-acetamidopiperidine-3-carboxylic acid and (3RS,5SR)-5-acetamidopiperidine-3-carboxylic acid, related to the specific γ-aminobutyric acid (GABA) uptake inhibitors (RS)-piperidine-3-carboxylic acid (nipecotic acid) and (3RS,5SR)-4-hydroxypiperidine-3-carboxylic acid, are described. (3RS,4SR)-3-Hydroxypiperidine-4-carboxylic acid, related to the specific GABA agonist piperidine-4-carboxylic acid (isonipecotic acid), has been synthesized. The affinity of the compds for the GABA receptors and for the neuronal (synaptosomal) GABA uptake system in vitro has been measured.
Compounds in my other articles are similar to this one(5-Hydroxynicotinic acid)Reference of 5-Hydroxynicotinic acid, you can compare them to see their pros and cons in some ways,such as convenient, effective and so on.
Reference:
Chapter 1 An introduction to palladium catalysis,
Palladium/carbon catalyst regeneration and mechanical application method