Reaktion #56497

Reaktionsgleichung

hydrogen

hydrogen

hydrogen

4-{3-[3-[3-(1-Hydroxycyclohexyl)-2-propynyl]-4-oxo-2-thiazolidinyl]propyl}benzoic Acid

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title product

4-{3-[3-[3-(1-Hydroxycyclohexyl)propyl]-4-oxo-2-thiazolidinyl]propyl}benzoic Acid

Lösungsmittel

ethyl acetate

Reaktionsbedingungen

Aufarbeitung

1. 1
   workup.ADDITIONof catalyst is added
2. 2
   Sonstigehas been absorbed
3. 3
   SonstigeThe catalyst is removed by filtration
4. 4
   Sonstigethe solvent evaporated
5. 5
   SonstigeThe residual oil is chromatographed on silica gel with elution by 2% methanol in chloroform
6. 6
   SonstigeThe chromatographed product crystalizes when
7. 7
   Sonstigetriturated with ether
8. 8
   SonstigeThere is obtained 1.2 g

Vorschrift

4-{3-[3-[3-(1-Hydroxycyclohexyl)-2-propynyl]-4-oxo-2-thiazolidinyl]propyl}benzoic Acid (4.0 g., 0.01 mole) is dissolved in ethyl acetate (45 ml.) and hydrogenated at 25° C. and one atmosphere pressure over 1.0 g. of a 5% palladium on charcoal catalyst. When 0.01 mole of hydrogen is absorbed (2 hours), uptake of hydrogen becomes very slow. An additional 1.5 g. of catalyst is added and hydrogenation continued for 70 hours until 0.02 mole of hydrogen has been absorbed. The catalyst is removed by filtration and the solvent evaporated. The residual oil is chromatographed on silica gel with elution by 2% methanol in chloroform. The chromatographed product crystalizes when triturated with ether. There is obtained 1.2 g. of the title product, m.p. 118°-121° C.

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