Methylamine → Ispronicline

HRID 1977159Notes

Reaction equation

HRID 1977159 reaction equation
C1(C)C=CC(S(O[C@@H:11]([CH2:13]/[CH:14]=[CH:15]/[C:16]2[CH:17]=[N:18][CH:19]=[C:20]([O:22][CH:23]([CH3:25])[CH3:24])[CH:21]=2)[CH3:12])(=O)=O)=CC=1.[CH3:27][NH2:28]>C(O)C>[CH3:27][NH:28][C@H:11]([CH2:13]/[CH:14]=[CH:15]/[C:16]1[CH:17]=[N:18][CH:19]=[C:20]([O:22][CH:23]([CH3:25])[CH3:24])[CH:21]=1)[CH3:12]

Participants

4

Reactant 2

HCID 6329MethylamineHCID 12052269(2R)-(4E)-5-(5-isopropoxy-3-pyridyl)4-penten-2-ol p-toluenesulfonate

Product 1

HCID 9824145IsproniclineYield 31%

Reagents, catalysts & solvents 1

HCID 702EthanolSolvent

Procedure

A mixture of (2R)-(4E)-5-(5-isopropoxy-3-pyridyl)-4-penten-2-ol p-toluenesulfonate (11.00 g, 29.33 mmol), methylamine (200 mL, 40% solution in water), and ethyl alcohol (10 mL) was stirred at ambient temperature for 18 h. The resulting solution was extracted with chloroform (3×100 mL). The combined chloroform extracts were dried over sodium sulfate, filtered, and concentrated by rotary evaporation. The crude product was purified by column chromatography over aluminum oxide, eluting with ethyl acetate-methanol (7:3, v/v). Selected fractions were combined and concentrated by rotary evaporation, producing an oil. Further purification by vacuum distillation furnished 2.10 g (31.0%) of a colorless oil, bp 90-100° C. at 0.5 mm Hg.

Workup

  1. extractionThe resulting solution was extracted with chloroform (3×100 mL)
  2. dry with materialThe combined chloroform extracts were dried over sodium sulfate
  3. filtrationfiltered
  4. concentrationconcentrated by rotary evaporation
  5. customThe crude product was purified by column chromatography over aluminum oxide
  6. washeluting with ethyl acetate-methanol (7:3
  7. concentrationconcentrated by rotary evaporation
  8. customproducing an oil
  9. customFurther purification
  10. distillationby vacuum distillation

Sources & evidence

ORD record
ord-8a4f9a17a16645e380ec0aa2a438b3b8
Source dataset
uspto-grants-2001_05
Patent number
US06232316B1

Reaction notes

Loading…