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Hydrochloric Acid → 1,2-Dihydro-10-hydroxy-8-(3-methyl-2-octyl)-5-oxo-4H,5H-thiopyrano[3,4-c][1]benzopyran

HRID 1657651
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Reaktionsgleichung

Reaktionsgleichung von HRID 1657651
[OH:1][C:2]1[C:7]2[C:8]3[CH2:15][CH2:14][S:13][C:9]=3[C:10](=[O:12])[O:11][C:6]=2[CH:5]=[C:4]([CH:16]([CH:18]([CH3:24])[CH2:19][CH2:20][CH2:21][CH2:22][CH3:23])[CH3:17])[CH:3]=1.O=[C:26]1CCSCC1C(OCC)=O.Cl>C(O)C>[OH:1][C:2]1[C:7]2[C:8]3[CH2:15][CH2:14][S:13][CH2:26][C:9]=3[C:10](=[O:12])[O:11][C:6]=2[CH:5]=[C:4]([CH:16]([CH:18]([CH3:24])[CH2:19][CH2:20][CH2:21][CH2:22][CH3:23])[CH3:17])[CH:3]=1
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Komponenten

5

Edukt 3

HCID 313Hydrochloric AcidHCID 256936Ethyl 4-oxotetrahydro-2H-thiopyran-3-carboxylateHCID 214339001,2-Dihydro-9-hydroxy-7-(3-methyl-2-octyl)-4-oxo-4H-thieno[2,3-c][1]benzopyran

Produkt 1

HCID 214339401,2-Dihydro-10-hydroxy-8-(3-methyl-2-octyl)-5-oxo-4H,5H-thiopyrano[3,4-c][1]benzopyranAusbeute 68 %

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 702
Ethanol
Lösungsmittel

Versuchsvorschrift

A solution of 6.4 g. (0.027 mole) of 5-(3-methyl-2-octyl-resorcinol of Example 1 and 5.0 g. (0.0266 mole) of ethyl 4-oxo-1,3,5,6-tetrahydro-4H-thiopyran-3-carboxylate [prepared according to the method of Bennett and Scorah, J. Chem. Soc., 194 (1927)] in 35 ml. of absolute ethanol was cooled in an ice bath while it was saturated with hydrogen chloride. The resulting deep red solution was tightly stoppered and allowed to stand at room temperature for 120 hours. After one day yellow crystalline material had collected on the bottom of the flask. The reaction mixture was warmed gently on the steam bath for 15 minutes, cooled and poured onto a water-ice mixture. The gum-like material that precipitated was extracted with several portions of chloroform. The chloroform solution was washed with aqueous potassium bicarbonate and with water and dried over sodium sulfate. Evaporation of the solvent left 7.5 g. of a light-colored solid. This material was triturated several times with boiling petroleum ether to remove unreacted keto ester. The residue was recrystallized from an ethyl acetate-petroleum ether mixture to give 6.5 g. (68%) of the desired compound, m.p. 153°-155°C.

Aufarbeitung

  1. customAfter one day yellow crystalline material had collected on the bottom of the flask
  2. temperatureThe reaction mixture was warmed gently on the steam bath for 15 minutes
  3. temperaturecooled
  4. additionpoured onto a water-ice mixture
  5. customThe gum-like material that precipitated
  6. extractionwas extracted with several portions of chloroform
  7. washThe chloroform solution was washed with aqueous potassium bicarbonate and with water
  8. dry with materialdried over sodium sulfate
  9. customEvaporation of the solvent
  10. waitleft 7.5 g
  11. customThis material was triturated several times with boiling petroleum ether
  12. customto remove unreacted keto ester
  13. customThe residue was recrystallized from an ethyl acetate-petroleum ether mixture
  14. customto give 6.5 g

Quellen und Nachweise

ORD-Eintrag
ord-4a537dd77a3f48c9bb4c19b9a0a0fa40
Quelldatensatz
uspto-grants-1976_06
DOI
10.6084/m9.figshare.5104873.v1
Patentnummer
US03960871

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