Classifications

• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D417/00—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and sulfur atoms as the only ring hetero atoms, not provided for by group C07D415/00
  • C07D417/02—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and sulfur atoms as the only ring hetero atoms, not provided for by group C07D415/00 containing two hetero rings
  • C07D417/12—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and sulfur atoms as the only ring hetero atoms, not provided for by group C07D415/00 containing two hetero rings linked by a chain containing hetero atoms as chain links
• • 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
  • C07D207/20—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 only hydrogen atoms, hydrocarbon or substituted hydrocarbon radicals, directly attached to ring carbon 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

Definitions

• the present invention relates to a process for the preparation of chiral 3, 4-dehydroprolines.
• Achiral syntheses usually start from pyrrolecarboxylic acid, which is reduced with phosphonium iodide / hydrogen iodide (J.W. Scott, Synth. Commun. 10 (1980) 529). The racemate is then separated by means of crystallization with chiral amines (S.S. Kerwar, J. Biol. Chem. 251 (1976) 503; US 4,066,658) or tartaric acid (A. Corbella, Chem. Ind. (1969) 583). The disadvantage of this synthesis is the handling of the highly toxic phosphine and a maximum yield of 50% in the resolution of racemates.
• the invention relates to a process for the preparation of chiral 3, 4-dehydroprolines of the formula I.
• R is a chiral auxiliary group
• R ' is hydrogen or a Ci-e-alkyl, C 2 - 7 alkenyl, C 7 -g-arylalkyl or tri-C ⁇ _ -alkylsilylrest and
• R '' mean a protective group, which consists in that a pyrrole carboxylic acid derivative of the formula II
• Non-aromatic chiral secondary amines and non-aromatic chiral alcohols of the formula RH are particularly suitable as sources for the chiral auxiliary groups R. As such, be special
• the compound D is particularly preferred.
• R ' is preferably hydrogen, C 3 alkyl, allyl or benzyl.
• the trimethylsilyl radical should be mentioned in particular as the tri-4-alkylsilyl radical.
• Protective groups for R ′′ include Boc, C ⁇ _ 6 -acyl, mesyl, benzenesulfonyl and tosyl and preferably Boc.
• Preferred leaving groups for X are Cl, Br, I, MesO, TosO or Trif lat.
• Magnesium and in particular lithium, sodium and potassium are mentioned as alkali or alkaline earth metals for the reaction.
• the reaction takes place in liquid or supercritical ammonia, to which an inert solvent can optionally be added.
• Preferred solvents are THF and Ci- 6 alcohols.
• the reaction is generally carried out in the temperature range from -100 to +100 ° C and a pressure range from 1 to 200 bar.
• the boiling point temperature of the reaction mixture and 1 bar is preferred.
• the reaction under self-pressure is very particularly preferred.
• the reaction is complete when pyrrole derivatives can no longer be detected in the reaction mixture (for example by means of GC, HPLC, DC).
• the processing of the process product is generally carried out using conventional processes, such as distillation, filtration, centrifugation or extraction.
• the process according to the invention can be carried out batchwise, e.g. be carried out in a stirred reactor.
• the simple feasibility offers the advantage that the reaction can also be carried out continuously, for example using a reaction tube or a stirred reactor cascade.
• the raw products obtained can, if desired, be further purified, e.g. by crystallization, extraction or chromatography.
• chiral 3, 4-dehydroprolines of the formula I which can be prepared in a simple manner by the process according to the invention are valuable intermediates for the synthesis of dyes, crop protection agents or medicaments, in particular thrombin inhibitors, such as e.g. described in PCT / WO 9625426.

Landscapes

• Chemical & Material Sciences (AREA)
• Organic Chemistry (AREA)
• Pyrrole Compounds (AREA)
• Plural Heterocyclic Compounds (AREA)
• Nitrogen Condensed Heterocyclic Rings (AREA)

Applications Claiming Priority (3)

Publications (1)

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• 1997
  • 1997-06-04 DE DE19723473A patent/DE19723473A1/de not_active Withdrawn
• 1998
  • 1998-06-02 CN CN98805882A patent/CN1259122A/zh active Pending
  • 1998-06-02 EP EP98933585A patent/EP0986538A1/de not_active Withdrawn
  • 1998-06-02 US US09/424,933 patent/US6166222A/en not_active Expired - Fee Related
  • 1998-06-02 IL IL13298898A patent/IL132988A0/xx unknown
  • 1998-06-02 JP JP50148499A patent/JP2002506430A/ja active Pending
  • 1998-06-02 HU HU0002772A patent/HUP0002772A3/hu unknown
  • 1998-06-02 AU AU83352/98A patent/AU8335298A/en not_active Abandoned
  • 1998-06-02 KR KR19997011338A patent/KR20010013342A/ko not_active Application Discontinuation
  • 1998-06-02 BR BR9809726-1A patent/BR9809726A/pt not_active IP Right Cessation
  • 1998-06-02 CA CA002291787A patent/CA2291787A1/en not_active Abandoned
  • 1998-06-02 WO PCT/EP1998/003284 patent/WO1998055456A1/de not_active Application Discontinuation
  • 1998-06-04 ZA ZA9804814A patent/ZA984814B/xx unknown
• 1999
  • 1999-12-03 NO NO995939A patent/NO995939D0/no not_active Application Discontinuation

Non-Patent Citations (1)

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