US3652651A - Synthesis of novel guanidino fatty acid esters - Google Patents

Synthesis of novel guanidino fatty acid esters Download PDF

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Publication number
US3652651A
US3652651A US770072A US3652651DA US3652651A US 3652651 A US3652651 A US 3652651A US 770072 A US770072 A US 770072A US 3652651D A US3652651D A US 3652651DA US 3652651 A US3652651 A US 3652651A
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United States
Prior art keywords
fatty acid
acid esters
synthesis
acid ester
amino
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Expired - Lifetime
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US770072A
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English (en)
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Setsuro Fujii
Kuramoto Shomachi
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    • CCHEMISTRY; METALLURGY
    • C07ORGANIC CHEMISTRY
    • C07CACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C279/00Derivatives of guanidine, i.e. compounds containing the group, the singly-bound nitrogen atoms not being part of nitro or nitroso groups
    • C07C279/04Derivatives of guanidine, i.e. compounds containing the group, the singly-bound nitrogen atoms not being part of nitro or nitroso groups having nitrogen atoms of guanidine groups bound to acyclic carbon atoms of a carbon skeleton
    • C07C279/14Derivatives of guanidine, i.e. compounds containing the group, the singly-bound nitrogen atoms not being part of nitro or nitroso groups having nitrogen atoms of guanidine groups bound to acyclic carbon atoms of a carbon skeleton being further substituted by carboxyl groups

Definitions

  • n and R are as defined above, with S-methyl thiourea or cyanamide.
  • This invention relates to the production of w-guanidino fatty acid esters.
  • the fatty acids as used in the present invention are those fatty acid having 4 to 6 carbon atoms.
  • the ester of such fatty acid is an alkyl (1-7 carbon atoms), arylalkyl or aryl ester wherein the arylalkyl is a benzyl group and the aryl is a phenyl group either of which may have or may not have in the aromatic ring such substituent as, for example, a methylol, methoxy, halogen, carboxyl or nitro group.
  • N32 CNNH r (IS-CH NH; H2N(CH2)nCOOR H NFNHUJHQDCOOR wherein nis 3 to and R is an alkyl, arylalkyl, arylalkyl or aryl group having 1 to 7 carbon atoms and which may be substituted as mentioned before.
  • guanidino fatty acid esters of the present invention are basic and therefore are preferable to be separated after converting the same into a salt with an acid which can form a salt with a guanidino base.
  • acids are inorganic acids such as hydrochloric acid, sulfuric acid, phosphoric acid or carbonic acid, and organic acids such as oxalic acid, tartaric acid or p-toluene sulfonic acid.
  • the w-guanidino fatty acid esters obtained by the present invention are novel compounds and have action to strongly inhibit the hydrolysis of alginine ester by kallikrein as shown in my concurrently filed patent application Ser. No. 769,815 and therefore are useful for a medicine as an antikallikrein agent.
  • An amino fatty acid ester which is the starting material in the process of the present invention may be prepared as follows. Thus, 0.2 mol of w-amino acid, ml. of a corresponding aliphatic alcohol or aromatic alcohol and 150 ml. of benzene are mixed together. The mixture is heated and refluxed while introducing a dry hydrochloric acid gas. The esterification reaction is conducted for 4 to 5 hours. Then the reaction product is concentrated under a reduced pressure and the residue is recrystallized from water, alcohol or acetone to obtain an w-amino fatty acid ester hydrochloride, the ester being an alkyl or arylalkyl ester.
  • 0.2 mol of an w-amino acid having had the amino group carbobenzyloxylated to be protected -by a known conventional process 0.2 mol of oor p-substituted phenol, 1 liter of tetrahydrofuran and 0.2 mol of phosphorus oxychloride are mixed together under cooling at l5 C. Then 32 ml. of pyridine are dropwise added thereto under this condition. The mixture is returned to the normal or room temperature after 30 minutes and is left to stand for 1 hour. Then the solution is separated under cooling, and the upper layer is concentrated under a reduced pressure. Then the protected group is removed by the treatment with glacial acetic acid and hydrobromic acid or by palladium reduction to obtain an w-amino fatty acid ester or its hydrobromate.
  • the w-amino fatty acid ester thus prepared is then dissolved in 200 to 300 ml. of water. To this solution is added 0.1 mol of S-methyl thiourea, and the mixture is allowed to react at 20 to 30 C. for 5 hours. Then the mixture is left to stand at the normal temperature and is ice-cooled after about 20 hours. The precipitated crystals are recovered by filtration and recrystallized from water.
  • the w-amino fatty acid ester is mixed into an aqueous solution of 1 to 10% ammonia in the presence of 10 to 20% cyanamide. The mixture is allowed to react until the final amino ester concentration becomes 30 to 40%. The solution is left to stand at the normal or room temperature or concentrated under a reduced pressure. The crystals formed are recovered and recrystallized from water.
  • n and R are as defined above, with S-methyl 45 thiourea or cyanamide.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Acyclic And Carbocyclic Compounds In Medicinal Compositions (AREA)
US770072A 1967-10-24 1968-10-23 Synthesis of novel guanidino fatty acid esters Expired - Lifetime US3652651A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP42068693A JPS502494B1 (enrdf_load_stackoverflow) 1967-10-24 1967-10-24

Publications (1)

Publication Number Publication Date
US3652651A true US3652651A (en) 1972-03-28

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ID=13381078

Family Applications (1)

Application Number Title Priority Date Filing Date
US770072A Expired - Lifetime US3652651A (en) 1967-10-24 1968-10-23 Synthesis of novel guanidino fatty acid esters

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US (1) US3652651A (enrdf_load_stackoverflow)
JP (1) JPS502494B1 (enrdf_load_stackoverflow)
BE (1) BE722520A (enrdf_load_stackoverflow)
CH (1) CH527800A (enrdf_load_stackoverflow)
DE (1) DE1804998A1 (enrdf_load_stackoverflow)
FR (1) FR1597579A (enrdf_load_stackoverflow)
SE (1) SE337367B (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6388122B1 (en) 1996-04-10 2002-05-14 Ono Pharmaceutical Co., Ltd. Tryptase inhibitor and novel guanidino derivatives

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6388122B1 (en) 1996-04-10 2002-05-14 Ono Pharmaceutical Co., Ltd. Tryptase inhibitor and novel guanidino derivatives

Also Published As

Publication number Publication date
CH527800A (de) 1972-09-15
FR1597579A (enrdf_load_stackoverflow) 1970-06-29
DE1804998A1 (de) 1969-06-19
SE337367B (enrdf_load_stackoverflow) 1971-08-09
JPS502494B1 (enrdf_load_stackoverflow) 1975-01-27
BE722520A (enrdf_load_stackoverflow) 1969-04-18

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