# Morpholine as a privileged scaffold for neurodegenerative disease therapeutics

**Authors:** Saranya Kattil Parmbil, Sunil Kumar, T. M. Rangarajan, Della Grace Thomas Parambi, Naseer Maliyakkal, Anél Petzer, Jacobus P. Petzer, Bijo Mathew

PMC · DOI: 10.1039/d6ra00100a · RSC Advances · 2026-03-04

## TL;DR

Morpholine compounds show promise as a drug scaffold for treating neurodegenerative and mental health disorders due to their ability to target key brain enzymes and pathways.

## Contribution

This study systematically reviews the pharmacological potential of morpholine derivatives in central nervous system drug development.

## Key findings

- Morpholine derivatives inhibit monoamine oxidases and cholinesterases effectively.
- They demonstrate improved blood–brain barrier permeability and balanced lipophilic–hydrophilic properties.
- Morpholine compounds often outperform conventional drugs in selectivity and efficacy.

## Abstract

Morpholine, a six-membered heterocyclic ring containing oxygen and nitrogen, is increasingly recognized in medicinal chemistry for its diverse pharmacological properties. Morpholine derivatives have shown promise as enzyme inhibitors, neurotransmitter modulators, and receptor agonists, making them candidates for treating neurodegenerative and neuropsychiatric disorders. The importance of this study lies in elucidating the therapeutic significance of morpholine in central nervous system (CNS) drug development, particularly in its role in inhibiting monoamine oxidases (MAO-A and MAO-B) and cholinesterases (AChE and BChE) and targeting the norepinephrine and dopamine pathways. Systematic searches of peer-reviewed literature were conducted to evaluate the structural significance and pharmacological potential of morpholine-based compounds. The findings reveal that morpholine derivatives exhibit promising efficacy and selectivity, often outperforming conventional drugs in specific contexts. These discoveries point to the possibility of morpholine as a valuable scaffold in CNS drug discovery due to its balanced lipophilic–hydrophilic profile and enhanced blood–brain barrier permeability. The implications of these findings are significant, and they call for future research to focus on optimizing morpholine derivatives to improve selectivity, efficacy, and safety, thereby expanding their therapeutic potential in CNS applications. Overall, this study emphasizes the importance of morpholine derivatives in advancing CNS therapeutics and their potential role in addressing unmet medical needs in neuropsychiatric disorder treatments.

The review emphasizes the importance of morpholine derivatives in advancing CNS therapeutics and their potential role in addressing unmet medical needs in neuropsychiatric disorder treatments.

## Linked entities

- **Proteins:** MAOA (monoamine oxidase A), MAOB (monoamine oxidase B), ACHE (acetylcholinesterase (Yt blood group)), BCHE (butyrylcholinesterase)
- **Chemicals:** morpholine (PubChem CID 8083)
- **Diseases:** neurodegenerative disease (MONDO:0005559)

## Full-text entities

- **Genes:** ACHE (acetylcholinesterase (Yt blood group)) [NCBI Gene 43] {aka ACEE, ARACHE, N-ACHE, YT}, Bche (butyrylcholinesterase) [NCBI Gene 12038] {aka C730038G20Rik}, PIK3CB (phosphatidylinositol-4,5-bisphosphate 3-kinase catalytic subunit beta) [NCBI Gene 5291] {aka P110BETA, PI3K, PI3KBETA, PIK3C1}, CYP3A4 (cytochrome P450 family 3 subfamily A member 4) [NCBI Gene 1576] {aka CP33, CP34, CYP3A, CYP3A3, CYPIIIA3, CYPIIIA4}, BChE [NCBI Gene 103221309], PIK3CA (phosphatidylinositol-4,5-bisphosphate 3-kinase catalytic subunit alpha) [NCBI Gene 5290] {aka CCM4, CLAPO, CLOVE, CWS5, HMH, MCAP}, Sigmar1 (sigma non-opioid intracellular receptor 1) [NCBI Gene 18391] {aka Oprs1, Sig1R, sigma1R}, Gfap (glial fibrillary acidic protein) [NCBI Gene 14580], MPO (myeloperoxidase) [NCBI Gene 4353], MAOB (monoamine oxidase B) [NCBI Gene 4129], MTOR (mechanistic target of rapamycin kinase) [NCBI Gene 2475] {aka FRAP, FRAP1, FRAP2, RAFT1, RAPT1, SKS}, DRD2 (dopamine receptor D2) [NCBI Gene 1813] {aka D2DR, D2R}, MAPT (microtubule associated protein tau) [NCBI Gene 4137] {aka DDPAC, FTD1, FTDP-17, MAPTL, MSTD, MTBT1}, RPTOR (regulatory associated protein of MTOR complex 1) [NCBI Gene 57521] {aka KOG1, Mip1}, BACE1 (beta-secretase 1) [NCBI Gene 23621] {aka ASP2, BACE, HSPC104}, PGP (phosphoglycolate phosphatase) [NCBI Gene 283871] {aka AUM, G3PP, PGPase}, Mgll (monoglyceride lipase) [NCBI Gene 23945] {aka Magl, Mgl}, MAOA (monoamine oxidase A) [NCBI Gene 4128] {aka BRNRS, MAO-A}, AChE [NCBI Gene 103246711], SIGMAR1 (sigma non-opioid intracellular receptor 1) [NCBI Gene 10280] {aka ALS16, DSMA2, HMNR2, OPRS1, SIG-1R, SR-BP}, INSIG1 (insulin induced gene 1) [NCBI Gene 3638] {aka CL6}, CYP1A1 (cytochrome P450 family 1 subfamily A member 1) [NCBI Gene 1543] {aka AHH, CP11, CYP1, CYPIA1, P1-450, P450-C}, Ache (acetylcholinesterase) [NCBI Gene 11423], CYP4F3 (cytochrome P450 family 4 subfamily F member 3) [NCBI Gene 4051] {aka CPF3, CYP4F, CYPIVF3, LTB4H}, Iba1 (induction of brown adipocytes 1) [NCBI Gene 114737], RICTOR (RPTOR independent companion of MTOR complex 2) [NCBI Gene 253260] {aka AVO3, PIA, hAVO3}, BCHE (butyrylcholinesterase) [NCBI Gene 590] {aka BCHED, CHE1, CHE2, E1}, Psen1 (presenilin 1) [NCBI Gene 19164] {aka Ad3h, PS-1, PS1, S182}, APP (amyloid beta precursor protein) [NCBI Gene 351] {aka AAA, ABETA, ABPP, AD1, APPI, CTFgamma}
- **Diseases:** breathing disorder (MESH:D012891), TSC (MESH:D014402), Functional Impairment (MESH:D003072), impaired movement (MESH:D009069), snoring (MESH:D012913), memory deterioration (MESH:D008569), OSA (MESH:D020181), type 2 diabetes (MESH:D003924), CINV (MESH:D020250), drug (MESH:D000081015), impulsiveness (MESH:D007174), depression (MESH:D003866), liver toxicity (MESH:D056486), cardiovascular and neuropsychological disorders (MESH:D002318), ADHD (MESH:D001289), cytotoxicity (MESH:D064420), weight loss (MESH:D015431), epilepsy (MESH:D004827), withdrawal (MESH:D013375), mental disease (MESH:D008607), apnoea (MESH:D001049), neurological disorders (MESH:D009461), seizures (MESH:D012640), opioid addiction (MESH:D009293), hyperactivity (MESH:D006948), anxiety disorder (MESH:D001008), sedative (MESH:C535788), vomiting (MESH:D014839), nausea (MESH:D009325), obesity (MESH:D009765), impaired reasoning skills (MESH:D019957), stroke (MESH:D020521), AD (MESH:D000544), Addiction (MESH:D019966), neuropsychiatric disorder (MESH:D001523), sleeplessness (MESH:D007319), neurotoxic (MESH:D020258), Huntington's disease (MESH:D006816), cancer (MESH:D009369), anorectic drug (MESH:D012002), schizophrenia (MESH:D012559), Anxiety (MESH:D001007), Neurodegenerative disorders (MESH:D019636), Narcolepsy (MESH:D009290), gastrointestinal problems (MESH:D012817), inattentiveness (MESH:D001308), Alzheimer's and Parkinson's diseases (MESH:D010300), mitochondrial dysfunction (MESH:D028361)
- **Chemicals:** acetate (MESH:D000085), tacrine (MESH:D013619), dopamine (MESH:D004298), halogen (MESH:D006219), bicuculline (MESH:D001640), morphine (MESH:D009020), sulpiride (MESH:D013469), AS (MESH:D001151), hydrogen (MESH:D006859), formaldehyde (MESH:D005557), serotonin (MESH:D012701), organotin (MESH:D009947), cannabinoid (MESH:D002186), safinamide (MESH:C092797), Monoacylglycerol (MESH:D050178), lisdexamfetamine (MESH:D000069478), reactive oxygen species (MESH:D017382), atomoxetine (MESH:D000069445), butyrylcholine (MESH:C017100), quinoline (MESH:C037219), ATP (MESH:D000255), dimethyl sulfate (MESH:C007482), GSH (MESH:D005978), Afobazole (MESH:C410924), naloxone (MESH:D009270), Morpholine (MESH:C037574), lipid (MESH:D008055), morpholines (MESH:D009025), ABTS (MESH:C002502), endocannabinoid (MESH:D063388), pargyline (MESH:D010293), guanfacine (MESH:D016316), aspartates (MESH:D001224), methylphenidate (MESH:D008774), amino acid (MESH:D000596), Moclobemide (MESH:D020912), chlorine (MESH:D002713), amine (MESH:D000588), FAD (MESH:D005182), 2-MeTHF (MESH:C587233), (+)-pentazocine (MESH:D010423), carbamate (MESH:D002219), chloroacetyl chloride (MESH:C045557), WIN 55,212-2 (MESH:C070417), 1,4-oxazinane (-), silicon (MESH:D012825), organosilane (MESH:D017646), heroin (MESH:D003932), PRE-084 (MESH:C071738), rivastigmine (MESH:D000068836), sulfur (MESH:D013455), neostigmine (MESH:D009388), donepezil (MESH:D000077265), amino alcohols (MESH:D000605), 2-arachidonoylglycerol (MESH:C094503), fingolimod (MESH:D000068876), benzodiazepine (MESH:D001569), potassium tert-butoxide (MESH:C077664), toloxatone (MESH:C010798), imine (MESH:D007097)
- **Species:** Rattus norvegicus (brown rat, species) [taxon 10116], Homo sapiens (human, species) [taxon 9606], Mus musculus (house mouse, species) [taxon 10090], Canis lupus familiaris (dog, subspecies) [taxon 9615]
- **Cell lines:** A2058 — Homo sapiens (Human), Amelanotic melanoma, Cancer cell line (CVCL_1059), hMAO-B. — Opodiphthera eucalypti (Emperor gum moth), Spontaneously immortalized cell line (CVCL_C2VY)

## Full text

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## Figures

26 figures with captions in the complete paper: https://tomesphere.com/paper/PMC12959329/full.md

## References

44 references — full list in the complete paper: https://tomesphere.com/paper/PMC12959329/full.md

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Source: https://tomesphere.com/paper/PMC12959329