Lysergic acid dipropylamide

Pharmaceutical compound From Wikipedia, the free encyclopedia

Lysergic acid dipropylamide (LSDP), also known as N,N-dipropyllysergamide (DPL), is a psychedelic drug of the lysergamide family related to lysergic acid diethylamide (LSD).^[1]^[2]^[3]^[4] It is the analogue of LSD in which the amide group has two propyl substitutions instead of two ethyl substituents.^[1]^[2]^[3]^[5]^[6]

Other namesLysergic acid dipropylamide; LSDP; LSDPr; LADP; LPP; N,N-Dipropyllysergamide; DPL

Routes of
administrationOral

Drug classSerotonergic psychedelic; Hallucinogen

ATC code

None

Quick facts Clinical data, Other names ...

LSDP
Clinical data


Other names	Lysergic acid dipropylamide; LSDP; LSDPr; LADP; LPP; N,N-Dipropyllysergamide; DPL
Routes of administration	Oral
Drug class	Serotonergic psychedelic; Hallucinogen
ATC code	None
Identifiers
IUPAC name (6aR,9R)-7-methyl-N,N-dipropyl-6,6a,8,9-tetrahydro-4H-indolo[4,3-fg]quinoline-9-carboxamide
PubChem CID	129714166
Chemical and physical data
Formula	C₂₂H₂₉N₃O
Molar mass	351.494 g·mol⁻¹
3D model (JSmol)	Interactive image
SMILES CCCN(CCC)C(=O)[C@H]1CN([C@@H]2CC3=CNC4=CC=CC(=C34)C2=C1)C
InChI InChI=1S/C22H29N3O/c1-4-9-25(10-5-2)22(26)16-11-18-17-7-6-8-19-21(17)15(13-23-19)12-20(18)24(3)14-16/h6-8,11,13,16,20,23H,4-5,9-10,12,14H2,1-3H3/t16-,20-/m1/s1 Key:QKKQYCDPPPJVQI-OXQOHEQNSA-N

The drug has about 10% or less of the potency of LSD as a psychedelic and its dose is greater than 1 mg orally.^[7]^[8]^[9]^[4]^[10] It has been reported however that, in contrast to LSD, LSDP produces LSD-like autonomic effects at much lower doses (<1 mg) than those at which its psychedelic effects occur.^[8]^[4]^[10] The drug was initially thought to be non-hallucinogenic after only being tested at sub-milligram doses.^[8]^[10]

LSDP was first described in the literature by Albert Hofmann and colleagues by 1955.^[11]^[10]^[4] Unlike various other LSD analogues, it was never given a specific code name (as in e.g. "LSD-25").^[12] Its psychedelic effects were also reported by Hofmann.^[4]

References

[1]
Shulgin AT, Shulgin A (1997). "#26. LSD-25 ACID; LYSERGIDE; D-LYSERGIC ACID DIETHYLAMIDE; METH-LAD; D-LYSERGAMIDE, N,N-DIETHYL; N,N-DIETHYL-D-LYSERGAMIDE; 9,10-DIDEHYDRO-N,N-DIETHYL-6-METHYLERGOLINE-8b-CARBOXAMIDE". TiHKAL: The Continuation (1st ed.). Berkeley, CA: Transform Press. pp. 490–499. ISBN 978-0-9630096-9-2. OCLC 38503252. The second major location of variations in the structure of LSD has been in the nature of the alkyl groups on the amide nitrogen atom. Some of these are Sandoz syntheses, some are from other research groups, and a few of them are found in nature. Some of these have been studied in man, and some have not. A few of the original clutch of Sandoz compounds have both 1-substituents and amide alkyl (R) group variations: [...] Indole R=: H. Amide nitrogen substituents: R=(CH2)2CH3. R=(CH2)2CH3. Code name: –. Chemical name: N,N-Dipropyllysergamide.
[2]
Pfaff RC, Huang X, Marona-Lewicka D, Oberlender R, Nichols DE (1994). "Lysergamides revisited". NIDA Research Monograph. 146: 52–73. PMID 8742794. The other major area now being examined is substitution on the amide function. Most lysergamides that have been subjected to clinical studies were reported in the mid- to late-1950s. Table 2 lists relative potency in humans for most of the amides that were studied. The amides were not studied systematically, and their characterization in clinical studies was rudimentary. [...] TABLE 2. Relative human potency of lysergic acid amides* [...] It should be noted in table 2 that none of the compounds has more than about 30 percent of the activity of LSD. This is something that has always perplexed researchers in this field: What is it about the diethyl group that may be unique in this molecule? Even a substitution with the same number of carbon atoms, such as the N-methyl-N-propyl derivative, shows only about one-thirtieth the potency of LSD. The N-methyl-N-propyl presumably would have similar pharmacokinetics, with comparable amounts of the drug expected to enter the brain, and yet this compound is only weakly active. Even the N-methyl-N-ethyl has low activity compared with LSD. With the N,N-diethyl (LSD) one sees optimum activity, but the N-ethyl-N-propyl is back to about one-third the potency of LSD, and N,N-dipropyl is down to one-tenth.
[3]
Shulgin AT (1980). "Hallucinogens". In Burger A, Wolf ME (eds.). Burger's Medicinal Chemistry. Vol. 3 (4 ed.). New York: Wiley. pp. 1109–1137. ISBN 978-0-471-01572-7. OCLC 219960627. Table 60.4 Hallucinogenic Lysergic Acid Amides [...]
[4]
Hofmann A (June 1959). "Psychotomimetic drugs; chemical and pharmacological aspects" (PDF). Acta Physiologica et Pharmacologica Neerlandica. 8: 240–258. PMID 13852489. Systematic variations of the substituents in the amide grouping has resulted in the synthesis of a great number of substances (STOLL and HOFMANN, 1955) which are listed in table 1. Pharmacological and clinical investigations of this group of compounds have not yet been concluded. None of these compounds shows the high specific psychic activity of LSD. The next higher and the next lower homologue of LSD, the lysergic acid dimethylamide and the dipropylamide, are about ten times less active on the psyche, but the vegetative effects are the same as that of the diethylamide. But there are some derivatives which have other interesting psychic effects, for example the monoethylamide and the unsubstituted amide show some sedative or even hypnotic effects. [...] TABLE 1 Variations in the acid amide group of the LSD molecule [...]
[5]
Nichols DE (2001). "LSD and Its Lysergamide Cousins" (PDF). The Heffter Review of Psychedelic Research. 2. Heffter Research Institute: 80–87. ISSN 1534-9640. Although ethyl groups have only two carbon atoms (denoted by the letter C in the structures), they are members of a much larger family of carbon atom chains called "alkyl groups." Alkyl groups with only one carbon atom are called methyl groups. Those with three carbon atoms are called propyl groups. Thus, not only do we have diethylamine, but also dimethylamine, dipropylamine, all permutations and combinations of two methyl, ethyl, and propyl groups, as well as a vast array of others with different carbon chain structures. These amines can all be "attached" to lysergic acid to yield lysergic acid dimethylamide, dipropylamide, methylpropylamide, ethylpropylamide, etc., giving many different substitutions on the amide group. Somewhat surprisingly, however, none of them approach the potency of LSD, and it is typical that they only have about one-tenth of the activity of LSD. This fact is one of the things we know now that make it so remarkable that Albert Hofmann chose to reexamine only the diethylamide.
[6]
Rutschmann J, Stadler PA (1978). "Chemical Background". In Berde B, Schild HO (eds.). Ergot Alkaloids and Related Compounds. Handbook of Experimental Pharmacology (HEP). Vol. 49. Berlin, Heidelberg: Springer Berlin Heidelberg. pp. 29–85. doi:10.1007/978-3-642-66775-6_2. ISBN 978-3-642-66777-0. Fig. 18. Synthetic amides of d-Iysergic acid and dihydrolysergic acid [...] (73d): Lysergic acid dipropylamide R1 = R2 = C3H7(n). [...]
[7]
Shulgin AT (2003). "Basic Pharmacology and Effects". In Laing RR (ed.). Hallucinogens: A Forensic Drug Handbook. Forensic Drug Handbook Series. Elsevier Science. pp. 67–137. ISBN 978-0-12-433951-4. Retrieved 1 February 2025. Table 3.23 Amide analogues and pyrrole derivatives of LSD [...] LA-dipropylamide [...]
[8]
Shulgin AT (1976). "Psychotomimetic Agents". In Gordon M (ed.). Psychopharmacological Agents: Use, Misuse and Abuse. Medicinal Chemistry: A Series of Monographs. Vol. 4. Academic Press. pp. 59–146. doi:10.1016/b978-0-12-290559-9.50011-9. ISBN 978-0-12-290559-9. Rothlin (1957) held that the ethyl group is unique for the psychic changes associated with the LSD intoxication. The N,N-diethyl compound is of full activity whether the indolic nitrogen is free or acetylated, but the removal of one of the ethyl groups (i.e., to form LAE-32, see Table I) drops the potency by a full order of magnitude. [...] Rothlin has reported that the N-monomethyl-, N,N-dimethyl-, N-monopropyl-, and N,N-dipropylamides of lysergic acid produce autonomic effects at sub milligram levels but none of the psychological disruptions seen with the ethyl compounds. A number of other investigators have reported, however, that LSD-like activity can be demonstrated with some of the close homologs. [...] TABLE 1 HUMAN POTENCY OF LSD ANALOGS WITH VARIOUS NITROGEN SUBSTITUTIONS [...]
[9]
Monte AP, Marona-Lewicka D, Kanthasamy A, Sanders-Bush E, Nichols DE (March 1995). "Stereoselective LSD-like activity in a series of d-lysergic acid amides of (R)- and (S)-2-aminoalkanes". Journal of Medicinal Chemistry. 38 (6): 958–966. doi:10.1021/jm00006a015. PMID 7699712. All of these studies revealed that 1 was unique in its high potency and ability to produce what are now regarded as classical hallucinogenic effects. Even analogs with minor modifications to the alkyl amide moiety had attenuated hallucinogenic activity in humans. Indeed, Hofmann noted that the next higher and lower homologs of LSD (1), the dipropylamide and the dimethylamide, respectively, were about 10 times less potent in producing the characteristic mental effects of 1.9
[10]
Rothlin E (March 1957). "Lysergic acid diethylamide and related substances". Annals of the New York Academy of Sciences. 66 (3): 668–676. Bibcode:1957NYASA..66..668R. doi:10.1111/j.1749-6632.1957.tb40756.x. PMID 13425249. It is noteworthy, from the chemical point of view, that only the monoethylamide and the diethylamide, whether of lysergic acid or of acetyl-lysergic acid, are able to produce significant psychic changes. Thus there can be no doubt that the ethyl group is particularly important in this respect. In this connection, it may be mentioned that the monomethylamide and dimethylamide and the monopropylamide and dipropylamide do not possess any psychic action. On the other hand, both in animals and in man the 4 latter compounds are capable of eliciting autonomic actions in doses in which the monoethylamide, for example, is completely inactive. Thus, a dose of 50 μg. of the dimethylamide of d-lysergic acid is sufficient to elicit marked autonomic responses, whereas as much as 500 μg. of the monoethylamide of d-lysergic acid are necessary to produce similar effects. With the latter compound, however, simultaneous psychic changes occur, whereas the monomethylamide and dimethylamide in doses sufficient to elicit autonomic responses cause no changes in the psyche.
[11]
Hofmann A, Stoll A (1955). "Amide der stereoisomeren Lysergsäuren und Dihydro‐lysergsäuren. 38. Mitteilung über Mutterkornalkaloide" [Amides of stereoisomeric lysergic and dihydrolysergic acids. 38. Ergot alkaloids]. Helvetica Chimica Acta. 38 (2): 421–433. doi:10.1002/hlca.19550380207. ISSN 0018-019X. Retrieved 5 June 2025.
[12]
Shulgin AT (1982). "Chemistry of Psychotomimetics". In Hoffmeister F, Stille G (eds.). Psychotropic Agents, Part III: Alcohol and Psychotomimetics, Psychotropic Effects of Central Acting Drugs. Handbook of Experimental Pharmacology. Vol. 55. Berlin: Springer Berlin Heidelberg. pp. 3–29. doi:10.1007/978-3-642-67770-0_1. ISBN 978-3-642-67772-4. OCLC 8130916.

Lysergic acid dipropylamide

See also

References

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