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John W. Huffman

1932–2022 · American · Clemson University (1960–2010); Georgia Institute of Technology (1957–1960)

John William Huffman was an organic chemist at Clemson University who trained under Robert Burns Woodward at Harvard and spent the second half of his career making cannabinoid receptor ligands under National Institute on Drug Abuse funding. Between 1984 and his retirement in 2010 his group synthesised more than 400 compounds — indoles, pyrroles, indenes and classical dibenzopyrans — which were numbered sequentially with his initials and sent to Billy Martin and Jenny Wiley's pharmacology group at Virginia Commonwealth University for testing. They were designed as research tools for mapping the CB1 and CB2 receptors, not as drugs for people. From late 2008 onward several of them, beginning with JWH-018, were found sprayed onto herbal 'incense' products sold as legal cannabis substitutes; Huffman spent his last years fielding calls from police, journalists and parents about compounds he had published openly a decade earlier.

Compounds credited overall: over 400 synthetic cannabinoids made between 1984 and his 2010 retirement (some reviews put the total above 450); roughly two dozen later turned up in herbal smoking blends

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Compounds

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24 credited across 1 class · 24 with a page here

  • Synthetic Cannabinoids
  • JWH-200 C25H24N2O2 popularised it, 1991 source

    CORRECTION TO THE USUAL STORY: despite the JWH code, this is not Huffman's compound. 1-(2-Morpholin-4-ylethyl)-3-(1-naphthoyl)indole was made at Sterling Drug (Sterling Winthrop) in 1991 as WIN 55,225, in the aminoalkylindole programme that also produced pravadoline and WIN 55,212-2. Huffman's group re-synthesised and re-tested it as a reference compound and gave it a notebook number; because the JWH label is the one that reached the drug market, it is now almost always filed under his name. Ki ~42 nM at CB1, about the same as THC. Role recorded as 'popularised' rather than 'first-synthesis' for that reason.

  • JWH-007 C25H25NO first synthesis, 1994 source

    1-Pentyl-2-methyl-3-(1-naphthoyl)indole; Ki 9.5 nM CB1, 2.9 nM CB2. Wikipedia states it was 'first reported in 1994 by a group including the noted cannabinoid chemist John W. Huffman', i.e. the same founding cannabimimetic-indole paper as JWH-015.

  • JWH-015 C23H21NO first synthesis, 1994 source

    1-Propyl-2-methyl-3-(1-naphthoyl)indole, from Huffman, Dai, Martin and Compton, 'Design, synthesis and pharmacology of cannabimimetic indoles' (Bioorg. Med. Chem. Lett. 4:563–566, 1994) — the paper that started the indole series by replacing WIN 55,212-2's aminoalkyl group with a plain alkyl chain. Ki 164 nM CB1 vs 13.8 nM CB2; one of the first compounds with genuinely useful CB2 selectivity, and still a standard laboratory CB2 agonist.

  • JWH-018 C24H23NO first synthesis, 1995 source

    1-Pentyl-3-(1-naphthoyl)indole; the pentyl member of the desmethyl naphthoylindole series and the first JWH compound found in a street product. Made in Huffman's lab in 1995 (C&EN dated the invention to that year) and published in the 1998 Wiley/Huffman/Martin SAR paper, which reported that 4- to 6-carbon N-alkyl chains gave optimal activity. Ki ~9 nM at CB1, ~2.9 nM at CB2, i.e. several times THC's CB1 affinity. Identified in Spice herbal blends by THC-Pharm of Frankfurt on 15 December 2008; banned in Germany 22 January 2009 and placed in US Schedule I (temporary) 1 March 2011.

  • JWH-030 C20H21NO first synthesis, 1995 source

    1-Pentyl-3-(1-naphthoyl)pyrrole, the archetype of the naphthoylpyrroles, introduced in Lainton, Huffman, Martin and Compton, '1-Alkyl-3-(1-naphthoyl)pyrroles: a new class of cannabinoid' (Tetrahedron Lett. 36:1401–1404, 1995). A CB1 partial agonist, Ki 87 nM — roughly half THC's potency — and the demonstration that the indole ring could be cut down to a pyrrole.

  • JWH-051 C25H38O2 first synthesis, 1996 source

    A 1-deoxy-11-hydroxy-Δ8-THC dimethylheptyl analogue — a 'classical' dibenzopyran rather than an indole — from Huffman, Yu, Showalter et al., 'Synthesis and pharmacology of a very potent cannabinoid lacking a phenolic hydroxyl with high affinity for the CB2 receptor' (J. Med. Chem. 39:3875–3877, 1996). Showed the phenolic hydroxyl of THC is not required for receptor binding, and was one of the first CB2-preferring ligands.

  • JWH-057 C25H38O first synthesis, 1996 source

    1-Deoxy analogue of Δ8-THC with high affinity at both receptors (Ki 23 nM CB1, 2.9 nM CB2). Grouped with JWH-051 in the 1996 deoxy-cannabinoid work; the compound-level year rests on the Huffman-series Ki table rather than an abstract that names the code.

  • JWH-019 C25H25NO first synthesis, 1998 source

    1-Hexyl-3-(1-naphthoyl)indole, the N-hexyl homolog of JWH-018 (Ki 9.8 nM CB1 / 5.55 nM CB2). Part of the same N-alkyl chain-length study that established pentyl as optimal for CB1; year is the publication date of that series, not a confirmed synthesis date. Wikipedia does not name the original synthesist explicitly, but the JWH designation and the Ki table in the Huffman-series list place it in his group.

  • JWH-073 C23H21NO first synthesis, 1998 source

    1-Butyl-3-(1-naphthoyl)indole, the N-butyl homolog of JWH-018; Ki ~8.9 nM at CB1 with roughly 3x CB1-over-CB2 selectivity. Year given is the 1998 JPET publication of the desmethyl naphthoylindole series rather than a documented bench date — JWH numbers are sequential lab-notebook codes, so synthesis preceded publication. Detected by University of Freiburg researchers on 20 April 2009 in a product sold as 'Forest Humus', and it spread through Spice-type blends after JWH-018 was banned in Germany.

  • JWH-133 C22H32O first synthesis, 1999 source

    3-(1',1'-Dimethylbutyl)-1-deoxy-Δ8-THC, from Huffman, Liddle, Yu, Aung, Abood, Wiley and Martin (Bioorg. Med. Chem. 7:2905–2914, 1999) — the paper is titled after this exact structure. Ki 3.4 nM at CB2 against 677 nM at CB1, roughly 200-fold CB2 selectivity. Widely used in laboratories as a CB2-selective probe and, unlike the naphthoylindoles, essentially absent from the recreational market.

  • JWH-175 C24H25N first synthesis, 2003 source

    (1-Pentylindol-3-yl)naphthalen-1-ylmethane — JWH-018 with the ketone replaced by a plain methylene bridge, Ki 22 nM at CB1, several times weaker than JWH-018. From Huffman, Mabon, Wu et al., '3-Indolyl-1-naphthylmethanes' (Bioorg. Med. Chem. 11:539–549, 2003), which argued for aromatic stacking rather than hydrogen bonding at CB1. The abstract uses numbered compounds rather than JWH codes, so the code-to-paper mapping comes from the Huffman-series list.

  • JWH-176 C25H24 first synthesis, 2003 source

    A cannabimimetic indene hydrocarbon with no nitrogen at all (Ki 26 nM at CB1), from the same 2003 naphthylmethanes paper — the abstract describes 'a cannabimimetic indene hydrocarbon'. Notable as the point at which the series left the indole scaffold entirely. Same code-mapping caveat as JWH-175.

  • JWH-081 C25H25NO2 first synthesis, 2005 source

    1-Pentyl-3-(4-methoxy-1-naphthoyl)indole; Ki 1.2 nM at CB1 vs 12.4 nM at CB2, about tenfold CB1-selective. Sources disagree on which paper introduced it — the Wikipedia Ki table cites Aung et al. (Drug Alcohol Depend. 2000) while the article body cites Huffman et al. (Bioorg. Med. Chem. 2003 and 2005). The 2005 paper is the one whose stated scope covers 4-methoxy naphthoyl substituents, so that year is used here.

  • JWH-122 C25H25NO first synthesis, 2005 source

    1-Pentyl-3-(4-methyl-1-naphthoyl)indole, the 4-methyl analogue of JWH-018 and one of the most potent compounds in the series (Ki 0.69 nM CB1, 1.2 nM CB2). Attributed to the 2005 Huffman naphthoylindole SAR paper on steric and electronic effects of naphthoyl substituents; the Wikipedia Ki table instead cites the 2003 naphthylmethanes paper, so the exact first report is not settled. Banned in Sweden on 1 October 2010 after appearing in herbal blends.

  • JWH-182 C27H29NO first synthesis, 2005 source

    1-Pentyl-3-(4-n-propyl-1-naphthoyl)indole; Ki 0.65 nM CB1, 1.1 nM CB2. The n-propyl member of the 4-substituted naphthoyl set explored in Huffman et al. 2005; Wikipedia does not name the individual synthesist, so the attribution rests on the series citation rather than a compound-level statement.

  • JWH-203 C21H22ClNO first synthesis, 2005 source

    1-Pentyl-3-(2-chlorophenylacetyl)indole; Ki 8.0 nM CB1, 7.0 nM CB2 — the highest receptor affinity of any compound in the phenylacetylindole class. From the same 2005 phenylacetylindole paper as JWH-250. Later appeared in synthetic cannabis products.

  • JWH-210 C26H27NO first synthesis, 2005 source

    1-Pentyl-3-(4-ethyl-1-naphthoyl)indole and the most CB1-potent of the 4-substituted naphthoyl derivatives (Ki 0.46 nM CB1, 0.69 nM CB2) — higher affinity than the 4-methyl (JWH-122), 4-n-propyl (JWH-182) and 4-methoxy (JWH-081) analogues. From the 2005 Huffman naphthoylindole SAR paper; banned in Sweden 1 October 2010 alongside JWH-122.

  • JWH-250 C22H25NO2 first synthesis, 2005 source

    1-Pentyl-3-(2-methoxyphenylacetyl)indole; Ki 11 nM CB1, 33 nM CB2. Introduced in Huffman, Szklennik, Almond et al., '1-Pentyl-3-phenylacetylindoles, a new class of cannabimimetic indoles' (Bioorg. Med. Chem. Lett. 2005), which showed a phenylacetyl group could replace the naphthoyl ring entirely. First identified in a seized product by the German Federal Criminal Police in May 2009, in the wave of blends that followed the JWH-018 ban.

  • JWH-251 C22H25NO first synthesis, 2005 source

    1-Pentyl-3-(2-methylphenylacetyl)indole; Ki 29 nM CB1, 146 nM CB2, about 5x CB1-selective. Part of the 2005 phenylacetylindole series that mapped how ortho substituents on the phenylacetyl ring change receptor preference.

  • JWH-147 C27H27NO first synthesis, 2006 source

    A naphthoylpyrrole from Huffman, Padgett, Isherwood, Wiley and Martin, '1-Alkyl-2-aryl-4-(1-naphthoyl)pyrroles: new high affinity ligands for the cannabinoid CB1 and CB2 receptors' (Bioorg. Med. Chem. Lett. 16:5432–5435, 2006). Ki 11 nM CB1, 7.1 nM CB2. Banned in Sweden on 1 October 2010 after appearing in synthetic cannabis products.

  • JWH-307 C26H24FNO first synthesis, 2006 source

    Naphthoylpyrrole from the same 2006 paper as JWH-147; Ki 7.7 nM CB1, 3.3 nM CB2. First seen in German herbal blends in 2012, one of the later JWH compounds to be picked up by manufacturers.

  • JWH-398 C24H22ClNO first synthesis, 2009 source

    1-Pentyl-3-(4-chloro-1-naphthoyl)indole; Ki 2.3 nM CB1, 2.8 nM CB2. Reported in Huffman's chapter in The Cannabinoid Receptors (Humana, 2009) and characterised in full in the 2012 halogenated-naphthoyl SAR paper by Wiley, Smith, Chen, Martin and Huffman. The EMCDDA had already found it in three 'herbal incense' products bought online between February and June 2009, so the bench synthesis clearly predates both publications; the year given is the first published report, not the synthesis date.

  • JWH-387 C24H22BrNO first synthesis, 2012 source

    1-Pentyl-3-(4-bromo-1-naphthoyl)indole; Ki 1.2 nM CB1, 1.1 nM CB2. One of sixteen new halogenated naphthoylindoles reported in Wiley, Smith, Chen, Martin and Huffman (Bioorg. Med. Chem. 2012), the last major paper of the series.

  • JWH-424 C24H22BrNO first synthesis, 2012 source

    1-Pentyl-3-(8-bromo-1-naphthoyl)indole; Ki 21 nM CB1, 5.4 nM CB2, roughly 4x CB2-selective. From the same 2012 paper, which showed that moving the halogen from the 4- to the 8-position of the naphthoyl ring shifts selectivity towards CB2.

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