Classifications

• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D207/00—Heterocyclic compounds containing five-membered rings not condensed with other rings, with one nitrogen atom as the only ring hetero atom
  • C07D207/02—Heterocyclic compounds containing five-membered rings not condensed with other rings, with one nitrogen atom as the only ring hetero atom with only hydrogen or carbon atoms directly attached to the ring nitrogen atom
  • C07D207/04—Heterocyclic compounds containing five-membered rings not condensed with other rings, with one nitrogen atom as the only ring hetero atom with only hydrogen or carbon atoms directly attached to the ring nitrogen atom having no double bonds between ring members or between ring members and non-ring members
  • C07D207/06—Heterocyclic compounds containing five-membered rings not condensed with other rings, with one nitrogen atom as the only ring hetero atom with only hydrogen or carbon atoms directly attached to the ring nitrogen atom having no double bonds between ring members or between ring members and non-ring members with radicals, containing only hydrogen and carbon atoms, attached to ring carbon atoms
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K31/00—Medicinal preparations containing organic active ingredients
  • A61K31/33—Heterocyclic compounds
  • A61K31/395—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins
  • A61K31/40—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having five-membered rings with one nitrogen as the only ring hetero atom, e.g. sulpiride, succinimide, tolmetin, buflomedil
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K31/00—Medicinal preparations containing organic active ingredients
  • A61K31/33—Heterocyclic compounds
  • A61K31/395—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins
  • A61K31/40—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having five-membered rings with one nitrogen as the only ring hetero atom, e.g. sulpiride, succinimide, tolmetin, buflomedil
  • A61K31/4015—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having five-membered rings with one nitrogen as the only ring hetero atom, e.g. sulpiride, succinimide, tolmetin, buflomedil having oxo groups directly attached to the heterocyclic ring, e.g. piracetam, ethosuximide
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D207/00—Heterocyclic compounds containing five-membered rings not condensed with other rings, with one nitrogen atom as the only ring hetero atom
  • C07D207/02—Heterocyclic compounds containing five-membered rings not condensed with other rings, with one nitrogen atom as the only ring hetero atom with only hydrogen or carbon atoms directly attached to the ring nitrogen atom
  • C07D207/04—Heterocyclic compounds containing five-membered rings not condensed with other rings, with one nitrogen atom as the only ring hetero atom with only hydrogen or carbon atoms directly attached to the ring nitrogen atom having no double bonds between ring members or between ring members and non-ring members
  • C07D207/10—Heterocyclic compounds containing five-membered rings not condensed with other rings, with one nitrogen atom as the only ring hetero atom with only hydrogen or carbon atoms directly attached to the ring nitrogen atom having no double bonds between ring members or between ring members and non-ring members with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
  • C07D207/12—Oxygen or sulfur atoms
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D207/00—Heterocyclic compounds containing five-membered rings not condensed with other rings, with one nitrogen atom as the only ring hetero atom
  • C07D207/02—Heterocyclic compounds containing five-membered rings not condensed with other rings, with one nitrogen atom as the only ring hetero atom with only hydrogen or carbon atoms directly attached to the ring nitrogen atom
  • C07D207/18—Heterocyclic compounds containing five-membered rings not condensed with other rings, with one nitrogen atom as the only ring hetero atom with only hydrogen or carbon atoms directly attached to the ring nitrogen atom having one double bond between ring members or between a ring member and a non-ring member
  • C07D207/22—Heterocyclic compounds containing five-membered rings not condensed with other rings, with one nitrogen atom as the only ring hetero atom with only hydrogen or carbon atoms directly attached to the ring nitrogen atom having one double bond between ring members or between a ring member and a non-ring member with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
  • C07D207/24—Oxygen or sulfur atoms
  • C07D207/26—2-Pyrrolidones
  • C07D207/263—2-Pyrrolidones with only hydrogen atoms or radicals containing only hydrogen and carbon atoms directly attached to other ring carbon atoms

Definitions

• the disclosure is drawn to processes for preparing (S)- 2,2,4-trimethylpyrrolidine free base or (,S)-2,2,4-trimethylpyrrolidine salts.
• the (,S)-2,2,4-trimethylpyrrolidine salt is (,S)-2,2,4-trimethylpyrrolidine hydrochloride.
• the disclosure is drawn to processes for preparing (R)- 2,2,4-trimethylpyrrolidine free base or (R)-2,2,4-trimethylpyrrolidine salts.
• the (R)-2,2,4-trimethylpyrrolidine salt is (R)-2,2,4-trimethylpyrrolidine hydrochloride.
• the disclosure is drawn to processes for preparing (S)- 3,5,5 -trimethylpyrrolidine-2-one .
• the disclosure is drawn to processes for (R)-3,5,5- trimethylpyrrolidine-2-one.
• Scheme 1 a process for preparing (,S)-2,2,4-trimethylpyrrolidine is depicted in Scheme 1 and comprises:
• a salt of 2,2,6,6-tetramethyl-piperidin-4-one is used.
• Non-limiting examples of salts include a hydrochloride salt, a hydrobromide salt, a sulfate salt, a phoshpate salt, a fumarate salt, an oxalate salt, a maleate salt, a citrate salt, or a benzoate salt.
• 2,2,6,6-tetramethyl-piperidin-4-one hydrochloride is used. These salts can be prepared by conventional methods in the art, by for example, treating 2,2,6,6-tetramethyl-piperidin-4-one with an acid.
• a process for preparing a salt of (S)-2,2,4- trimethylpyrrolidine comprises:
• a process for preparing a salt of (R)-2,2,4- trimethylpyrrolidine comprises:
• reaction in (b) is conducted without isolation of the product(s) of the reaction in (a). This results in a process with fewer purifications and less reliance on materials and solvents, which can provide compound 3 in higher efficiency and lower cost.
• Scheme 4 a process for preparing (,S)-3,5,5-trimethylpyrrolidin-2- one is depicted in Scheme 4 and comprises:
• Scheme 5 a process for preparing (R)-3,5,5-trimethylpyrrolidin-2- one is depicted in Scheme 5 and comprises:
• 2,2,6,6-tetramethyl-piperidin-4-one or a salt thereof is reacted with chloroform and at least one base.
• the at least one base is chosen from potassium t-butoxide, potassium hydroxide, and sodium hydroxide.
• the at least one base is sodium hydroxide.
• 3 to 15 molar equivalents of the at least one base relative to the mole of 2,2,6,6-tetramethylpiperidin-4-one are added for the reaction in (a). In some embodiments, 5 to 12 molar equivalents of the at least one base are added. In some embodiments, 7.5 molar equivalents of the at least one base are added. In some embodiments, 10 molar equivalents of said at least one base are added. In some embodiments, 8 molar equivalents of sodium hydroxide are added.
• the at least one base in the reaction (a) is in solid form in at least one anhydrous solvent.
• the at least one anhydrous solvent is chosen from dimethyl sulfoxide and isopropyl alcohol.
• the at least one base in the reaction (a) is in the form of an aqueous solution having a concentration ranging from 20 wt% to 80 wt% relative to the total weight of the solution.
• the at least one base is 20 wt% aqueous NaOH.
• the at least one base is 30 wt% aqueous NaOH.
• the at least one base is 40 wt% aqueous NaOH.
• the at least one base is 50 wt% aqueous NaOH.
• chloroform in the reaction (a) is present in an amount ranging from 1 to 4 molar equivalents relative to the mole of 2,2,6,6-tetramethylpiperidin- 4-one. In some embodiments, the chloroform is present in an amount ranging from 1.5 to 3.5 molar equivalents relative to the mole of 2,2,6,6-tetramethylpiperidin-4-one. In some embodiments, the chloroform is present in an amount of 1.75 molar equivalents relative to the mole of 2,2,6,6-tetramethylpiperidin-4-one.
• 2,2,6,6-tetramethyl-piperidin-4-one or a salt thereof is reacted with chloroform, at least one base, and at least one solvent.
• the at least one solvent is chosen from organic solvents.
• the at least one solvent is immiscible with water.
• the volume of the at least one solvent ranges from 0.1 to 10 volume equivalents relative to the volume of 2,2,6,6- tetramethylpiperidin-4-one.
• the volume of the at least one solvent ranges from 1 to 4 volume equivalents relative to the volume of 2,2,6,6- tetramethylpiperidin-4-one.
• the volume of the at least one solvent ranges from 1 to 3 volume equivalents relative to the volume of 2,2,6,6- tetramethylpiperidin-4-one. In some embodiments, the volume of the at least one solvent ranges from 1.5 to 2.5 volume equivalents relative to the volume of 2,2,6,6- tetramethylpiperidin-4-one. In some embodiments, the volume of the at least one solvent is 2 volume equivalents of the at least one solvent relative to the volume of 2,2,6,6- tetramethylpiperidin-4-one.
• the at least one solvent is chosen from dichloromethane, heptane, chloroform, trifluorotoluene, tetrahydrofuran (THF), and N- methylpyrrolidone (NMP).
• the at least one solvent is chosen from dichloromethane and heptane.
• the at least one solvent is di chl oromethane .
• reaction (a) is performed without the at least one solvent.
• reaction in (a) is performed without the use of phase transfer catalyst.
• phase transfer catalyst in the reaction in (a), in addition to chloroform and at least one base, 2,2,6,6-tetramethyl-piperidin-4-one is reacted with at least one phase transfer catalyst.
• the at least one phase transfer catalyst is chosen from tetraalkylammonium salts and crown ethers such as 18-crown-6 and 15-crown-5 phase transfer catalysts.
• the at least one phase transfer catalyst is chosen from crown ethers, such as 18-crown-6 and 15-crown-5 phase transfer catalysts.
• the at least one phase transfer catalyst is chosen from
• the at least one phase transfer catalyst is chosen from tetraalkylammonium halides. In some embodiments, the at least one phase transfer catalyst is chosen from tributylmethylammonium chloride,
• tributylmethylammonium bromide tributylmethylammonium bromide, tetrabutylammonium bromide (TBAB),
• TBAC tetrabutylammonium chloride
• TBAI tetrabutylammonium iodide
• TBAH tetrabutylammonium hydroxide
• TOAB tetraoctylammonium bromide
• TO AC tetraoctyl ammonium chloride
• TOAI tetraoctylammonium iodide
• trioctylmethylammonium chloride and
• 0.01 molar equivalents to 0.2 molar equivalents of the at least one phase transfer catalyst relative to the mole of 2,2,6,6-tetramethylpiperidin-4-one is added to the reaction in (a).
• 0.02 molar equivalents to 0.1 molar equivalents of said at least one phase transfer catalyst relative to the mole of 2,2,6,6- tetramethylpiperidin-4-one is added.
• 0.03 molar equivalents to 0.06 molar equivalents of said at least one phase transfer catalyst relative to the mole of 2,2,6,6-tetramethylpiperidin-4-one is added.
• 0.01 molar equivalents to 1 molar equivalent such as to 0.2 molar equivalents, 0.4 molar equivalents, 0.6 molar equivalents, or 0.8 molar equivalents of said at least one phase transfer catalyst relative to the mole of 2,2,6,6-tetramethylpiperidin-4-one is added.
• the acid of the reaction in (b) is chosen from aqueous solutions of protic acids.
• the protic acids are chosen from hydrochloric acid, methane sulfonic acid, triflic acid, and sulfuric acid.
• the concentration of said aqueous solutions of protic acids range from 1M to 18M. In some embodiments, the concentration of said aqueous solutions of protic acids range from 2M to 10M.
• the acid of the reaction in (b) is chosen from HC1 having a concentration ranging from 2M to 3M. In some embodiments, the acid of the reaction in (b) is chosen from 2M HC1.
• the acid of the reaction in (b) is chosen from 2.5M HC1. In some embodiments, the acid of the reaction in (b) is chosen from 3M HC1. In some embodiments, 0.5 to 10 molar equivalents of said acid relative to the mole of 2,2,6,6-tetramethylpiperidin-4-one are added to the reaction in (b). In some embodiments, 1 to 4 molar equivalents of said acid relative to the mole of 2,2,6,6-tetramethylpiperidin-4-one are added to the reaction in (b). In some embodiments, 1.5 molar equivalents of said acid relative to the mole of 2,2,6,6-tetramethylpiperidin-4- one are added to the reaction in (b).
• the yield of 5,5-dimethyl-3-methylenepyrrolidin-2-one produced from the reactions in (a) and (b) ranges from 40% to 70% relative to the mole of 2,2,6,6-tetramethylpiperidin-4-one. In some embodiments, the yield of 5,5-dimethyl-3- methylenepyrrolidin-2-one produced from the reactions in (a) and (b) ranges from 30% to 80%) relative to the mole of 2,2,6,6-tetramethylpiperidin-4-one. In some embodiments, the yield of 5,5-dimethyl-3-methylenepyrrolidin-2-one produced from the reactions in (a) and
• (b) ranges from 50%> to 70% relative to the mole of 2,2,6,6-tetramethylpiperidin-4-one.
• the yield of 5,5-dimethyl-3-methylenepyrrolidin-2-one produced from the reactions in (a) and (b) ranges from 60% to 80% relative to the mole of 2,2,6,6- tetramethylpiperidin-4-one.
• the hydrogenation comprises reacting 5,5-dimethyl-3- methylenepyrrolidin-2-one with at least one catalyst and hydrogen gas to produce (S)- 3,5,5-trimethyl-pyrrolidin-2-one.
• the at least one catalyst is chosen from metals from the platinum group.
• platinum group means ruthenium, rhodium, palladium, osmium, iridium, and platinum.
• the at least one catalyst is chosen from ruthenium hydrogenation catalysts, rhodium hydrogenation catalysts, and iridium hydrogenation catalysts.
• the hydrogenation comprises reacting 5,5-dimethyl-3- methylenepyrrolidin-2-one with at least one catalyst and hydrogen gas to produce (R)- 3,5,5-trimethyl-pyrrolidin-2-one.
• the at least one catalyst is chosen from ruthenium hydrogenation catalysts, rhodium hydrogenation catalysts, and iridium hydrogenation catalysts.
• the at least one catalyst may be heterogeneous or homogeneous. In some embodiments, the at least one catalyst is heterogeneous. In some embodiments, the at least one catalyst is homogenous. In some embodiments, the at least one catalyst comprises platinum. In some embodiments, the at least one catalyst comprises rhodium, ruthenium, or iridium. In some embodiments, the at least one catalyst employs at least one ligand. In some embodiments, the at least one ligand is chiral. In some embodiments, the at least one catalyst employs at least one phosphorus-containing ligand.
• the hydrogenation is enantioselective. Enantioselective hydrogenation can be done using a chiral ligand.
• the at least one catalyst employs at least one chiral phosphorus-containing ligand. In some embodiments, the at least one chiral phosphorus-containing ligand is a chiral tertiary diphosphine. In some embodiments, the at least one catalyst employs at least one atropisomeric ligand, such as BINAP, Tol-BINAP, T-BINAP, H8-BINAP, Xyl-BINAP, DM-BINAP, or MeOBiphep.
• the at least one catalyst employs at least one segphos-based ligand, such as segphos, dm-segphos, or dtbm-segphos. In some embodiments, the at least one catalyst employs at least one chiral ferrocenyl-based ligand, such as Josiphos, Walphos, Mandyphos, or Taniaphos.
• BINAP include (R)-(+)-(l, 1 '-Binaphthalene-2,2'-diyl)bis(diphenylphosphine), (R)-(+)-2,2'- Bis(diphenylphosphino)- 1 , 1 '-binaphthalene ((R)-(+)-BINAP), (S)-(-)-( 1 , 1 '-Binaphthalene- 2,2'-diyl)bis(diphenylphosphine), and (,S)-(-)-2,2'-Bis(diphenylphosphino)-l, - binaphthalene (OS)-(-)-BINAP)).
• Tol-BINAP is (R)-(+)-2,2'- Bis(di- >-tolylphosphino)-l, l '-binaphthyl.
• T-BINAP include ( ⁇ -H ⁇ '- ⁇ -tolyl-phosphino)- 1, 1 '-binaphthyl, (S)-Tol-BINAP.
• H8-BINAP examples include (R)-(+)-2,2'-Bis(diphenylphospino)-5,5',6,6',7,7',8,8'-octahydro-l, l '-binaphthyl, [(lR)-5,5',6,6',7,7',8,8'-octahydro-[l, l '-binaphthalene]-2,2'-diyl]bis[diphenylphosphine], and (5)-(-)-2,2'-Bis(diphenylphospino)-5,5',6,6',7,7',8,8'-octahydro-l, l '-binaphthyl, [(15)- 5,5',6,6',7,7',8,8'-octahydro-[l, l '-binaphthalene]-2,2'-diyl]
• Non- limiting examples of DM-BINAP include (R)-(+)-l, l '-Binaphthalene-2,2'-diyl)bis[bis(3,5- dimethylphenyl)phosphine] and (R)-(+)-2,2 '-Bi s [di(3 , 5 -xylyl)phosphino]- 1 , 1 '-binaphthyl .
• a non-limiting example of Xyl-BINAP is fR (+)-XylBINAP and (Sj-(+)-XylBINAP available from Takasago International Corp.
• MeOBiphep examples include (R)-(6,6'-Dimethoxybiphenyl-2,2'-diyl)bis[bis(3,5-di-tert-butyl-4- methoxyphenyl)phosphine, (,S)-(6,6'-Dimethoxybiphenyl-2,2'-diyl)bis[bis(3,5-di-tert- butyl-4-methoxyphenyl)phosphine, (R)-(6,6'-Dimethoxybiphenyl-2,2'-diyl)bis[bis(3,5-di- tert-butylphenyl)phosphine], (,S)-(6,6'-Dimethoxybiphenyl-2,2'-diyl)bis[bis(3,5-di-tert- butylphenyl)phosphine] , (R)-(6,6 '-Dimethoxybiphenyl
• segphos include (R)-(+)-5,5'-Bis(diphenylphosphino)-4,4'-bi-l,3-benzodioxole (or [4(R)-(4,4'-bi- l,3-benzodioxole)-5,5'-diyl]bis[diphenylphosphine]) and (S)-(-)-5,5'- Bis(diphenylphosphino)-4,4'-bi-l,3-benzodioxole.
• Non-limiting examples of dtbm- segphos include (R)-(-)-5,5'-Bis[di(3,5-di-tert-butyl-4-methoxyphenyl)phosphino]-4,4'-bi- 1,3-benzodioxole (or [(4R)-(4,4'-bi-l,3-benzodioxole)-5,5'-diyl]bis[bis(3,5-di-tert-butyl-4- methoxyphenyl)phosphine]) and (,S)-(+)-5,5'-Bis[di(3,5-di-tert-butyl-4- methoxyphenyl)phosphino]-4,4'-bi-l,3-benzodioxole.
• Examples of dm-segphos include (,S)-(+)-5,5'-Bis[di(3,5-di-tert-butyl-4-methoxyphenyl)phosphino]-4,4'-bi-l,3- benzodioxole and (R)-(+)-5,5'-Bis[di(3,5-xylyl)phosphino]-4,4'-bi-l,3-benzodioxole (or [(4R)-(4,4'-bi-l,3-benzodioxole)-5,5'-diyl]bis[bis(3,5-dimethylphenyl)phosphine]).
• Non- limiting examples of chiral ferrocenyl-based ligands can be found in US 2015/0045556 (the chiral ligand descriptions of which are incorporated herein by reference).
• Non- limiting examples chiral ferrocenyl-based ligands include:
• the hydrogenation is carried out in the presence of at least one chiral ligand.
• the at least one chiral ligand is chosen from phosphine ligands, BINOL, TADDOL, BOX, DuPhos, DiPAMP, BINAP, Tol-BINAP, T- BINAP, H8-BINAP, DM-BINAP, Xyl-BINAP, MeOBiphep, DIOP, PHOX, PyBox, SALENS, SEGPHOS, DM-SEGPHOS, DTBM-SEGPHOS, JOSIPHOS, MANDYPHOS, WALPHOS, TANIAPHOS, sPHOS, xPHOS, SPANphos, Triphos, Xantphos, and Chiraphos ligands.
• the at least one chiral ligand is a SEGPHOS ligand. In some embodiments, the at least one chiral ligand is a MANDYPHOS ligand. In some embodiments, the at least one chiral ligand is a MANDYPHOS SL-M004-1 available from, for example, Solvias. In some embodiments, the at least one chiral ligand is chosen from the following:
• the hydrogenation is carried out in the presence of at least one transition metal.
• the at least one transition metal is chosen from the platinum group metals.
• the at least one transition metal is chosen from rhodium, ruthenium, rhenium, and palladium.
• the at least one transition metal is ruthenium. In some embodiments, the at least one transition metal is rhodium. [0038] In some embodiments, hydrogenation is carried out in the presence of at least one catalyst chosen from: [Rh(nbd)Cl] 2 ; [Rh(COD) 2 OC(0)CF 3 ]; [Rh(COD)(Ligand A)BF 4 ; [Rh(COD)(Ligand B)BF 4 ; [Rh(COD)(Ligand C)BF 4 ; and [Rh(COD)(Ligand
• hydrogenation is carried out in the presence of [RuCl(p-cymene) ⁇ ( ? ) -segphos ⁇ ]Cl; [RuC ⁇ p-cymene)! ⁇ - binap ⁇ ]Cl; and/or [ 1 ⁇ 2Me 2 ][ ⁇ RuCl[fR segphos] ⁇ 2 ⁇ -Cl) 3 ].
• the hydrogenation is carried out in the presence of at least one catalyst prepared in situ with a metal precursor and a ligand.
• the at least one ligand is chosen from chiral ligands set forth above. In some embodiments, the at least one ligand is chosen from:
• At least one metal precursor is chosen from [Rh(nbd)Cl] 2 ;
• the hydrogenation is carried out at a temperature of 10 °C to 70 °C. In some embodiments, hydrogenation is carried out at a temperature of 30 °C to 50 °C. In some embodiments, hydrogenation is carried out at 45 °C. In some embodiments, hydrogenation is carried out at 30 °C.
• the disclosed process comprises reducing (S)- or (R)- 3,5,5-trimethyl-pyrrolidin-2-one to produce (S)- or (R)-2,2,4-trimethylpyrrolidine, respectively.
• the reduction is performed in the presence of at least one reducing agent.
• the at least one reducing agent is a hydride.
• the hydride is chosen from lithium aluminum hydride, lithium aluminum deuteride, sodium bis(2-methoxyethoxy)aluminumhydride, and borane. In some embodiments, 1-2 equivalents of hydride are added.
• the reducing agent is lithium aluminum hydride.
• the reduction is carried out at 40 °C to 100 °C. In some embodiments, the reduction is carried out at 40 °C to 80 °C. In some embodiments, the reduction is carried out at 50 °C to 70 °C. In some embodiments, the reduction is carried out at 68 °C.
• the reducing agent is hydrogen gas.
• the reduction is carried out in the presence of one or more catalysts and hydrogen gas. In some embodiments, the reduction is carried out in the presence of one or more metallic catalysts and hydrogen gas. In some embodiments, the reduction is carried out under a catalytic hydrogenation condition in the presence of one or more catalysts and hydrogen gas.
• the catalyst is chosen from Pt, Co, Sn, Rh, Re, and Pd. In some embodiments, the reduction is carried out in the presence of hydrogen gas and one or more catalysts chosen from Pt, Co, Sn, Rh, Re, and Pd.
• the reduction is carried out in the presence of hydrogen gas and one or more monometallic or bimetallic catalysts chosen from Pt, Pd, Pt-Re, Pt-Co, Pt-Sn, Pd-Re, and Rh-Re. Any suitable amounts of such catalysts can be used for the reduction. In some embodiments, 0.1 wt% - 5 wt% of such catalysts can be used. In some embodiments, such catalysts are used in one or more support materials selected from TiCh, S1O2, AI2O3 (e.g., theta-AhCb or gamma-AhCb), and zeolite.
• monometallic or bimetallic catalysts chosen from Pt, Pd, Pt-Re, Pt-Co, Pt-Sn, Pd-Re, and Rh-Re. Any suitable amounts of such catalysts can be used for the reduction. In some embodiments, 0.1 wt% - 5 wt% of such catalysts can be used. In some embodiments, such catalysts are used in
• the reduction is carried out in the presence of hydrogen gas and one or more monometallic or bimetallic catalysts chosen from Pt-Sn in T1O2 (or Pt-Sn/ T1O2), Pt-Re in T1O2 (or Pt-Re/ T1O2), Pt in T1O2 (or Pt/ T1O2), Rh in T1O2 (or Rh/ T1O2), Rh-Re in T1O2 (or Rh-Re/ T1O2), Pt-Sn in theta-Ah0 3 (or Pt-Sn/ theta-AhOs), Pt-Sn in S1O2 (or Pt-Sn/ S1O2), and Pt-Sn in T1O2 (or Pt-Sn/ T1O2).
• Pt-Sn in T1O2 or Pt-Sn/ T1O2
• Pt-Re in T1O2 or Pt-Re/ T1O2
• Pt in T1O2 or Pt
• the reduction is carried out in the presence of hydrogen gas and one or more monometallic or bimetallic catalysts chosen from 4wt%Pt-2 wt%Sn in T1O2 (or 4wt%Pt-2wt%Sn/Ti0 2 ), 4wt%Pt-2wt%Re in T1O2 (or 4wt%Pt-2wt%Re/Ti0 2 ), 4wt%Pt in T1O2 (or 4wt%Pt/Ti0 2 ), 4wt%Rh in T1O2 (or 4wt%Rh/Ti0 2 ), 4wt%Rh-2%Re in T1O2 (or 4wt%Rh-2wt%Re/Ti0 2 ), 4wt%Pt-2wt%Sn in theta-Al 2 0 3 (or 4wt%Pt-2wt%Sn/theta- AI2O3), 4wt%Pt-2wt%Sn in S1O
• the reducing agent is quenched after reaction. In some embodiments, the reducing agent is quenched by sodium sulfate. In some embodiments, the reducing agent is quenched by water and then 15 wt% KOH in water.
• the product from the reduction step with a hydride is further treated with acid to produce a salt.
• the acid is chosen from hydrochloric acid, hydrobromic acid, phosphoric acid, sulfuric acid, oxalic acid, citric acid, a tartaric acid (e.g., L- or D- tartaric acid or dibenzoyl tartaric acid), a malic acid (e.g., L- or D-malic acid), a maleic acid (e.g., L- or D-maleic acid, 4-bromo-mandelic acid or 4-bromo-mandelic acid), a tartranilic acid (e.g., L- or D-tartranilic acid, (2,3)-2'-methoxy-tartranilic acid), a mandelic acid (e.g., L- or D-mandelic acid, 4-methyl-mandelic acid.
• hydrochloric acid e.g., hydrobromic acid, phosphoric acid, sulfuric acid, oxalic acid, citric acid, a tartaric acid (e.g., L- or D- tart
• O-acetyl mandelic acid or 2- chloromandelic acid a tartaric acid (e.g., L- or D-mandelic acid, di-p-toluoyltartaric acid, di-p-anisoyltartaric acid), acetic acid, alpha-methoxy-phenyl acetic acid, a lactic acid (e.g., L- or D-lactic acid, 3-phenyllactic acid), a phenylalanine (e.g., N-acetyl-phenylalanine, Boc-homophenylalanine, or Boc-phenylalanine), a glutamic acid (e.g., L- or D-glutamic acid or pyroglutamic acid), phencyphos hydrate, chlocyphos, camphor sulfonic acid, camphoric acid, anisyphos, 2-phenylpropionic acid, N-acetyl-leucine, BINAP phosphate,
• the reduction and acid treatment reactions are performed without isolation of the reduction product.
• (R)-3,5,5-trimethyl- pyrrolidin-2-one is reacted with a hydride and then with an acid to produce an (R)-2,2,4- trimethylpyrrolidine salt.
• (,S)-3,5,5-trimethyl-pyrrolidin-2-one is reacted with a hydride and then with an acid to produce an (,S)-2,2,4-trimethylpyrrolidine salt.
• the reduction step product (e.g. (S)- or (R)-2,2,4- trimethylpyrrolidine) is isolated before the acid treatment step.
• (S)- 2,2,4-trimethylpyrrolidine is treated with an acid to produce a salt of (S)-2,2,4- trimethylpyrrolidine.
• (R)-2,2,4-trimethylpyrrolidine is treated with an acid to produce a salt of (R)-2,2,4-trimethylpyrrolidine.
• Scheme 1 above the piperidone ring of Compound 2 is contracted and acid is added to promote formation of predominantly Compound 3.
• Compound 3 is hydrogenated in the presence of chiral ligands to produce Compound 4S in (S) configuration.
• the carbonyl group of Compound 4S is reduced to form Compound IS.
• the (S) configuration of Compound 4S is retained in Compound IS.
• Scheme 2 above the piperidone ring of Compound 2 is contracted and acid is added to promote formation of predominantly Compound 3.
• the olefin group of Compound 3 is hydrogenated in the presence of chiral ligands to produce Compound 4R in (R) configuration.
• the carbonyl group of Compound 4R is reduced to form Compound 1R.
• the (R) configuration of Compound 4R is retained in Compound 1R.
• Compound 2 is commercially available.
• contraction of piperidone ring of Compound 2 to yield pyrrolidine of Compound 3 is carried out in the presence of NaOH and tri-butyl methyl ammonium chloride.
• the reaction is further treated with hydrochloric acid to promote predominantly Compound 3.
• Compound 3 undergoes enantioselective hydrogenation in the presence of chiral ruthenium catalysts with phosphine ligands.
• Compound 4S or 4R is reduced with lithium aluminum hydride. In some embodiments, Compound 4S or 4R is reduced with lithium aluminum deuteride.
• structures depicted herein are also meant to include compounds that differ only in the presence of one or more isotopically enriched atoms.
• Compounds IS, 1R, 3, 4S, and 4R, wherein one or more hydrogen atoms are replaced with deuterium or tritium, or one or more carbon atoms are replaced by a 13 C- or 14 C-enriched carbon are within the scope of this invention.
• Compounds IS, 1R, 3, 4S, and 4R, wherein one or more hydrogen atoms are replaced with deuterium are prepared by the methods described herein. Such compounds are useful, for example, as analytical tools, probes in biological assays, or compounds with improved therapeutic profile.
• a listing of exemplary embodiments includes:
• a process for preparing (,S)-2,2,4-trimethylpyrrolidine or a salt thereof comprising: (a) reacting 2,2,6,6-tetramethyl-piperidin-4-one or a salt thereof with chloroform and at least one base;
• phase transfer catalyst is chosen from tetraalkylammonium salts.
• phase transfer catalyst is chosen from tributylmethylammonium chloride, tributylmethylammonium bromide, tetrabutylammonium bromide (TBAB), tetrabutylammonium chloride (TBAC), tetrabutylammonium iodide (TBAI), tetrabutylammonium hydroxide (TBAH),
• benzyltrimethylammonium chloride tetraoctylammonium bromide (TAOB)
• TAOC tetraoctylammonium chloride
• TAOI tetraoctylammonium iodide
• trioctylmethylammonium chloride and trioctylmethylammonium bromide.
• a process for preparing 5,5-dimethyl-3-methylenepyrrolidin-2-one comprising:
• phase transfer catalyst in the reaction in (a) is chosen from tributylmethylammonium chloride, tributylmethylammonium bromide, tetrabutylammonium bromide (TBAB),
• TBAC tetrabutylammonium chloride
• TBAI tetrabutylammonium iodide
• TBAH tetrabutylammonium hydroxide
• TOAB tetraoctylammonium bromide
• TO AC tetraoctyl ammonium chloride
• TOAI tetraoctylammonium iodide
• trioctylmethylammonium chloride and trioctylmethylammonium bromide.
• protic acids are chosen from hydrochloric acid, methane sulfonic acid, triflic acid, and sulfuric acid.
• phase transfer catalyst is chosen from tributylmethylammonium chloride, tributylmethylammonium bromide, tetrabutylammonium bromide (TBAB), tetrabutylammonium chloride (TBAC), tetrabutylammonium iodide (TBAI), tetrabutylammonium hydroxide (TBAH), benzyltrimethylammonium chloride, tetraoctylammonium bromide (TOAB),
• TO AC tetraoctylammonium chloride
• TOAI tetraoctylammonium iodide
• trioctylmethylammonium chloride and trioctylmethylammonium bromide.
• protic acids are chosen from hydrochloric acid, methane sulfonic acid, triflic acid, and sulfuric acid.
• phase transfer catalyst in the reaction in (a) is chosen from tributylmethylammonium chloride, tributylmethylammonium bromide, tetrabutylammonium bromide (TBAB),
• TBAC tetrabutylammonium chloride
• TBAI tetrabutylammonium iodide
• TBAH tetrabutylammonium hydroxide
• benzyltrimethylammonium chloride tetrabutylammonium hydroxide
• TOAB tetraoctylammonium bromide
• TO AC tetraoctyl ammonium chloride
• TOAI tetraoctylammonium iodide
• trioctylmethylammonium chloride and
• protic acids are chosen from hydrochloric acid, methane sulfonic acid, triflic acid, and sulfuric acid.
• phase transfer catalyst in the reaction in (a) is chosen from tributylmethylammonium chloride, tributylmethylammonium bromide, tetrabutylammonium bromide (TBAB),
• TBAC tetrabutylammonium chloride
• TBAI tetrabutylammonium iodide
• TBAH tetrabutylammonium hydroxide
• benzyltrimethylammonium chloride tetrabutylammonium hydroxide
• TOAB tetraoctylammonium bromide
• TO AC tetraoctyl ammonium chloride
• TOAI tetraoctylammonium iodide
• trioctylmethylammonium chloride and
• protic acids are chosen from hydrochloric acid, methane sulfonic acid, triflic acid, and sulfuric acid.
• the at least one solvent is chosen from dichloromethane, heptane, chloroform, trifluorotoluene, tetrahydrofuran (THF), and N-methylpyrrolidone (NMP).
• the reaction mixture was stirred at 300 rpm, and 50 wt% NaOH (195.81 g, 133.2 mL, 2,447.863 mmol, 8.000 equiv) was added dropwise (via addition funnel) over 1.5 h while maintaining the temperature below 25 °C with intermittent ice/acetone bath.
• the reaction mixture was stirred at 500 rpm for 18 h, and monitored by GC (3% unreacted piperidinone after 18 h).
• the suspension was diluted with DCM (100.0 mL, 2.00 vol) and H2O (300.0 mL, 6.00 vol), and the phases were separated.
• the aqueous phase was extracted with DCM (100.0 mL, 2.00 vol).
• the organic phases were combined and 3 M hydrochloric acid (16.73 g, 153.0 mL, 458.974 mmol, 1.500 equiv) was added. The mixture was stirred at 500 rpm for 2 h. The conversion was complete after approximately 1 h.
• the aqueous phase was saturated with NaCl, H2O (100.0 mL, 2.00 vol) was added to help reduce the emulsion, and the phases were separated.
• the aqueous phase was extracted with DCM (100.0 mL, 2.00 vol) twice. H2O (100.0 mL, 2.00 vol) was added to help with emulsion separation.
• the organic phases were combined, dried (MgS0 4 ), and
• the suspension was diluted with DCM (683.3 kg) and water (1544.4 kg).
• the organic phase was separated.
• the aqueous phase was extracted with DCM (683.3 kg).
• the organic phases were combined, cooled to 10°C and then 3 M hydrochloric acid (867.8 kg, 2559.0 mol, 1.5 eq.) was added.
• the mixture was stirred at 10-15 °C for 2 h.
• the organic phase was separated.
• the aqueous phase was extracted with DCM (683.3 kg x 2).
• the organic phases were combined, dried over Na 2 S04 (145.0 kg) for 6 h.
• the solid was filtered off and washed with DCM (120.0 kg).
• the filtrate was stirred with active charcoal (55 kg) for 6 h.
• Step 1 Preparation of Rh Catalyst Formation: In a 3 L Schlenk flask, 1.0 L of tetrahydrofuran (THF) was degassed with an argon stream. Mandyphos Ligand SL- M004-1 (1.89 g) and [Rh(nbd)Cl] 2 (98%, 0.35 g) (chloronorbornadiene rhodium(I) dimer) were added. The resulting orange catalyst solution was stirred for 30 min at room temperature to form a catalyst solution.
• THF tetrahydrofuran
• Step 2 A 50 L stainless steel autoclave was charged with 5,5-dimethyl-3- ⁇ methylenepyrrolidin-2-one (6.0 kg, Compound (3)) and THF (29 L). The autoclave was sealed and the resulting suspension was flushed with nitrogen (3 cycles at 10 bar), and then released of pressure. Next the catalyst solution from Step 1 was added. The autoclave was flushed with nitrogen without stirring (3 cycles at 5 bar) and hydrogen (3 cycles at 5 bar). The pressure was set to 5 bar and a 50 L reservoir was connected. After 1.5 h with stirring at 1000 rpm and no hydrogen uptake the reactor was flushed again with nitrogen (3 cycles at 10 bar) with stirring and additional catalyst solution was added.
• the autoclave was again flushed to hydrogen with the above described procedure (3 x 5 bar N2, 3 x 5 bar H2) and adjusted to 5 bar. After 2 h, the pressure was released, the autoclave was flushed with nitrogen (3 cycles at 5 bar) and the product solution was discharged into a 60 L inline barrel. The autoclave was charged again with THF (5 L) and stirred with 1200 rpm for 5 min. The wash solution was added to the reaction mixture.
• Step 3 The combined solutions were transferred into a 60 L reactor.
• the inline barrel was washed with 1 L THF which was also added into the reactor.
• 20 L THF were removed by evaporation at 170 mbar and 40°C.
• 15 L heptane were added.
• the distillation was continued and the removed solvent was continuously replaced by heptane until the THF content in the residue was 1% w/w (determined by NMR).
• the reaction mixture was heated to 89°C (turbid solution) and slowly cooled down again (ramp: 14°C/h). Several heating and cooling cycles around 55 to 65°C were made.
• Example 2A and 2B Analytical chiral HPLC method for the determination of the conversion, chemoselectivity and enantiomeric excess of the products form Example 2A and 2B was made under the following conditions: Instrument: Agilent Chemstation 1100; Column: Phenomenex Lux 5u Cellulose— 2, 4.6 mm x 250 mm x 5 um, LHS6247; Solvent:
• the reaction mixture was cooled to 30° C then saturated sodium sulfate solution (20.9 ml) was added dropwise over 30 minutes, keeping the temperature below 40° C. Vigorous evolution of hydrogen was observed and the reaction mixture thickened but remained mixable. The mixture thinned towards the end of the addition.
• the mixture was cooled to 20° C, diluted with iPrOAc (100 ml) and stirred for an additional 10 minutes. The suspension was then drained and collected through the lower outlet valve, washing through with additional iPrOAc (50 ml). The collected suspension was filtered through a Celite pad on a sintered glass funnel under suction and washed with iPrOAc (2x50 ml).
• reaction mixture was cooled to 22 °C and sampled to check for completion, then cautiously quenched with the addition of EtOAc (1.0 L, 10 moles, 0.16 eq) followed by a mixture of THF (3.4 L) and water (2.5 kg, 2.0 eq) then followed by a mixture of water (1.75 kg) with 50 % aqueous sodium hydroxide (750 g, 2 eq water with 1.4 eq sodium hydroxide relative to aluminum), followed by 7.5 L water (6 eq "Fieser” quench). After the addition was completed, the reaction mixture was cooled to room temperature, and the solid was removed by filtration and washed with THF (3 x 25 L).
• the filtrate and washings were combined and treated with 5.0 L (58 moles) of aqueous 37% HC1 (1.05 equiv.) while maintaining the temperature below 30°C.
• the resultant solution was concentrated by vacuum distillation to a slurry in two equal part lots on the 20 L Buchi evaporator.
• Isopropanol (8 L) was charged and the solution reconcentrated to near dryness by vacuum distillation.
• Isopropanol (4 L) was added and the product slurried by warming to about 50 °C. Distillation from Isopropanol continued until water content by KF is ⁇ 0.1 %.
• Methyl tertbutyl ether (6 L) was added and the slurry cooled to 2-5 °C.
• reaction mixture was cooled to below 40 °C and cautiously quenched with drop-wise addition of a saturated aqueous solution of Na 2 S0 4 (209 mL) over 2 h. After the addition was completed, the reaction mixture was cooled to ambient temperature, diluted with /-PrOAc (1 L), and mixed thoroughly. The solid was removed by filtration (Celite pad) and washed with / ' -PrOAc (2 x 500 mL). With external cooling and N 2 blanket, the filtrate and washings were combined and treated with drop- wise addition of anhydrous 4 M HC1 in dioxane (492 mL; 2.95 mol; 1 equiv.) while maintaining the temperature below 20 °C.
• a reactor was charged with lithium aluminum hydride (LAH) (1.20 equiv.) and 2-MeTHF (2-methyltetrahydrofuran) (4.0 vol), and heated to internal temperature of 60 °C while stirring to disperse the LAH.
• LAH lithium aluminum hydride
• 2-MeTHF 2-methyltetrahydrofuran
• a solution of (3 ⁇ 4 ) -3,5,5-trimethylpyrrolidin-2-one (1.0 equiv) in 2-MeTHF (6.0 vol) was prepared and stirred at 25 °C to fully dissolve the (S)-
• the resulting slurry was cooled to -10 °C (-15 to -5°C) linearly over no less than 12 h.
• the slurry was stirred at -10 °C for no less than 2 h.
• the solids were isolated via filtration or centrifugation and were washed with a solution of 2-MeTHF (2.25 vol) and IPA (isopropanol) (0.75 vol).
• the solids were dried under vacuum at 45 ⁇ 5 °C for not less than 6 h to yield (,S)-2,2,4-trimethylpyrrolidine hydrochloride ((1S) » HC1).
• the reaction mixture was stirred until completion and assessed by GC analysis.
• the reaction mixture was diluted with DCM (2.0 mL, 4.0v) and H2O (3.0 mL, 6.0v).
• the phases were separated and the aqueous phase was extracted with DCM (1.0 mL, 2.0v).
• the organic phases were combined and 2 M hydrochloric acid (0.17 g, 2.3 mL, 4.59 mmol, 1.5 eq.) was added.
• the reaction mixture was stirred until completion, assessed by HPLC.
• the aqueous phase was saturated with NaCl and the phases were separated.
• the reaction mixture was stirred until completion and assessed by GC analysis.
• the reaction mixture was diluted with DCM (2.0 mL, 4.0v) and H2O (3.0 mL, 6.0v).
• the phases were separated and the aqueous phase is extracted with DCM (1.0 mL, 2.0v).
• the organic phases were combined and 2 M hydrochloric acid (0.17 g, 2.3 mL, 4.59 mmol, 1.5 eq.) was added.
• the reaction mixture was stirred until completion, assessed by HPLC.
• the aqueous phase was saturated with NaCl and the phases were separated.
• the aqueous phase was extracted with DCM (1.0 mL,
• Tetrabutylammonium hydroxide (0.01 eq.), TBAB (0.01 eq.), Tributylmethylammonium chloride (0.01 eq.), Tetrabutylammonium hydroxide (0.02 eq.), TBAB (0.02 eq.), Tributylmethylammonium chloride (0.02 eq.), Tetrabutylammonium hydroxide (0.03 eq.), TBAB (0.03 eq.), Tributylmethylammonium chloride (0.03 eq.).
• the reaction mixture was diluted with DCM (2.0 mL, 4.0v) and H 2 0 (3.0 mL, 6.0v). The phases were separated and the aqueous phase was extracted with DCM (1.0 mL, 2.0v). The organic phases were combined and 2 M hydrochloric acid (0.17 g, 2.3 mL, 4.59 mmol, 1.5 eq.) was added. The reaction mixture was stirred until completion, assessed by HPLC. The aqueous phase was saturated with NaCl and the phases were separated. The aqueous phase was extracted with DCM (1.0 mL, 2.0v) twice, the organic phases were combined, and 50 mg of biphenyl in 2 mL of MeCN was added as an internal HPLC standard. Solution yield was assessed by HPLC. The reaction results are summarized in the following table:

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