GB773468A - Process for the production of 3-substituted 4-hydroxy-coumarins - Google Patents

Process for the production of 3-substituted 4-hydroxy-coumarins

Info

Publication number
GB773468A
GB773468A GB23383/55A GB2338355A GB773468A GB 773468 A GB773468 A GB 773468A GB 23383/55 A GB23383/55 A GB 23383/55A GB 2338355 A GB2338355 A GB 2338355A GB 773468 A GB773468 A GB 773468A
Authority
GB
United Kingdom
Prior art keywords
ester
malonic acid
benzyl
aryl
heated
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB23383/55A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Novartis AG
Original Assignee
JR Geigy AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by JR Geigy AG filed Critical JR Geigy AG
Publication of GB773468A publication Critical patent/GB773468A/en
Expired legal-status Critical Current

Links

Classifications

    • CCHEMISTRY; METALLURGY
    • C07ORGANIC CHEMISTRY
    • C07DHETEROCYCLIC COMPOUNDS
    • C07D311/00Heterocyclic compounds containing six-membered rings having one oxygen atom as the only hetero atom, condensed with other rings
    • C07D311/02Heterocyclic compounds containing six-membered rings having one oxygen atom as the only hetero atom, condensed with other rings ortho- or peri-condensed with carbocyclic rings or ring systems
    • C07D311/04Benzo[b]pyrans, not hydrogenated in the carbocyclic ring
    • C07D311/42Benzo[b]pyrans, not hydrogenated in the carbocyclic ring with oxygen or sulfur atoms in positions 2 and 4

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)

Abstract

4-Hydroxycoumarins and their 1-thio analogues of the general formula: <FORM:0773468/IV(b)/1> (wherein X is O or S, R is alkyl, alkoxyalkyl, aryloxyalkyl, aryl or alkylmercaptoalkyl, aralkyl, aryl, arylaryl, or aralkylaryl wherein aromatic nuclei can be substituted by halogen, alkyl, alkoxy or nitro groups, and Ar is o-arylene aryl-o-arylene or aralkyl-o-arylene wherein aromatic nuclei can be substituted by halogen, alkyl or alkoxy groups) are prepared by heating to at least 240 DEG C., preferably 300 DEG C., a -substituted malonic acid diaryl esters of formula Ar1XCOCHRCOXAr1, wherein Ar1 represents the aryl, arylaryl or aralkylaryl radical corresponding to Ar, having a hydrogen atom in at least one o-position with regard to X. In examples: (1) isoamyl malonic acid diphenyl ester is heated 90 minutes at 300 DEG C. in a flask fitted with a wide sloping tube, phenol distils off, the residue is extracted with sodium hydroxide solution and 3-isoamyl-4-hydroxycoumarin precipitated with HCl; similarly prepared are 3 - methyl -, ethyl -, n - propyl -, isopropyl -, n - butyl -, n - amyl -, isoamyl, n-hexyl -, phenyl -, and benzyl - 4 - hydroxycoumarin; (2) benzylmalonic acid bis-(p-benzylphenyl) ester is heated in a sausage flask, and then 4-benzylphenol distilled off under reduced pressure, leaving 3,6 - dibenzyl - 4 - hydroxycoumarin; (3) benzylmalonic acid bis-(p-phenylphenyl) ester is heated at 300 DEG C., and p-phenylphenol removed by steam distillation, yielding 3-benzyl-4-hydroxy-6-phenylcoumarin; (4) benzylmalonic acid bis-(o-benzyl-p-chlorophenyl) ester is heated as above and 3,8-dibenzyl - 4 - hydroxy - 6 - chlorocoumarin isolated by extraction with boiling aqueous caustic soda lye, filtration and acidification. Other starting materials specified for the cyclisation process are benzyl dithiolmalonic acid diphenyl ester, 4-chlorobenzyl malonic acid bis-p-cresyl ester, 2-methyl-benzyl malonic acid bis-4-methoxyphenyl ester, 3,4-dimethoxy-benzyl malonic acid diphenyl ester, 4-bromophenyl malonic acid diphenyl ester, 4-isopropylphenyl malonic acid diphenyl ester and 4-methoxyphenyl malonic acid diphenyl ester.
GB23383/55A 1954-08-17 1955-08-15 Process for the production of 3-substituted 4-hydroxy-coumarins Expired GB773468A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH773468X 1954-08-17

Publications (1)

Publication Number Publication Date
GB773468A true GB773468A (en) 1957-04-24

Family

ID=4535611

Family Applications (1)

Application Number Title Priority Date Filing Date
GB23383/55A Expired GB773468A (en) 1954-08-17 1955-08-15 Process for the production of 3-substituted 4-hydroxy-coumarins

Country Status (1)

Country Link
GB (1) GB773468A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3022317A (en) * 1956-01-20 1962-02-20 Geigy Chem Corp 3-benzyl-4-hydroxycoumarin and a process for the preparation of derivatives of 3-benzyl-4-hydroxycoumarin

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3022317A (en) * 1956-01-20 1962-02-20 Geigy Chem Corp 3-benzyl-4-hydroxycoumarin and a process for the preparation of derivatives of 3-benzyl-4-hydroxycoumarin

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