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

HRID 1657653Notes

Reaction equation

HRID 1657653 reaction equation
[CH3:1][CH:2]([CH2:13][CH2:14][CH2:15][CH2:16][CH3:17])[CH:3]([C:5]1[CH:6]=[C:7]([OH:12])[CH:8]=[C:9]([CH:11]=1)[OH:10])[CH3:4].C[O:19][C:20]([CH:22]1[C:27](=O)[CH2:26][CH2:25][CH2:24][S:23]1)=O.Cl>C(O)C>[OH:10][C:9]1[C:8]2[C:27]3[CH2:26][CH2:25][CH2:24][S:23][C:22]=3[C:20](=[O:19])[O:12][C:7]=2[CH:6]=[C:5]([CH:3]([CH:2]([CH3:1])[CH2:13][CH2:14][CH2:15][CH2:16][CH3:17])[CH3:4])[CH:11]=1

Participants

5

Reactant 3

HCID 313Hydrochloric AcidHCID 2581765-(3-Methyloctan-2-yl)benzene-1,3-diolHCID 18379299Methyl 3-oxotetrahydrothiopyran-2-carboxylate

Product 1

HCID 214339161,2-Dihydro-10-hydroxy-8-(3-methyl-2-octyl)-5-oxo-3H,5H-thiopyrano[2,3-c][1]benzopyran

Reagents, catalysts & solvents 1

HCID 702EthanolSolvent

Procedure

A solution of 14.2 g. (0.06 mole) of 5-(3-methyl-2-octyl)resorcinol and 11.1 g. (0.063 mole) of methyl-3-oxo-2,3,4,5-tetrahydro-6H-thiopyran-2-carboxylate in 90 ml. of absolute ethanol was cooled in an ice-salt bath and saturated with anhydrous hydrogen chloride. After standing for 2 days at room temperature, the ethanol was removed on a rotary evaporator. The residue was dissolved in ether, washed with sodium bicarbonate solution and dried over sodium sulfate. Evaporation of the solvent gave 28.0 g. of residue which was chromatographed using magnesium silicate (60-100 mesh) and graded methanol/chloroform solvent mixtures. A total of 10 g. of crude solid was obtained frm the 1% methanol/chloroform fractions. The material was recrystallized twice from ethyl acetate/hexane to give 8.5 g. 40%) of colorless crystals, m.p. 131°-133°C. The proposed structure was confirmed by infrared and nuclear magnetic resonance spectra.

Workup

  1. customthe ethanol was removed on a rotary evaporator
  2. dissolutionThe residue was dissolved in ether
  3. washwashed with sodium bicarbonate solution
  4. dry with materialdried over sodium sulfate
  5. customEvaporation of the solvent
  6. customgave 28.0 g
  7. customof residue which was chromatographed
  8. customof crude solid was obtained frm the 1% methanol/chloroform fractions
  9. customThe material was recrystallized twice from ethyl acetate/hexane
  10. customto give 8.5 g

Sources & evidence

ORD record
ord-045ba0592bf84b2e87b80cc1ca5e0e4f
Source dataset
uspto-grants-1976_06
Patent number
US03960871

Reaction notes

Loading…