5-[[3,5-Bis(1,1-dimethylethyl)-4-hydroxyphenyl]methylene]-2-thioxo-4-thiazolidinone → 5-(3,5-Bis(tert-butyl)-4-hydroxyphenyl)methylene-4-thiazolidinone
Reaktionsgleichung
[CH3:1][C:2]([C:5]1[CH:6]=[C:7]([CH:16]=[C:17]2[S:21][C:20](=S)[NH:19][C:18]2=[O:23])[CH:8]=[C:9]([C:12]([CH3:15])([CH3:14])[CH3:13])[C:10]=1[OH:11])([CH3:4])[CH3:3]>C(O)C.[Pd]>[CH3:4][C:2]([C:5]1[CH:6]=[C:7]([CH:16]=[C:17]2[S:21][CH2:20][NH:19][C:18]2=[O:23])[CH:8]=[C:9]([C:12]([CH3:13])([CH3:14])[CH3:15])[C:10]=1[OH:11])([CH3:1])[CH3:3]Komponenten
4
Edukt 1
Produkt 1
Reagenzien, Katalysatoren, Lösungsmittel 2
Versuchsvorschrift
A solution of 69.90 g of 5-[[3,5-bis(1,1-dimethylethyl)-4-hydroxyphenyl]methylene}-2-thioxo-4-thiazolidinone in 4 liters of ethanol was hydrogenated at 500 pounds per square inch (psi) in the presence of 200 g of 5% palladium on carbon overnight at 100° C. The reaction mixture was filtered and evaporated to dryness. In sections, the material was dissolved in 1 volume of hot ethyl acetate, diluted with 2 volumes of hexane, filtered, and loaded onto a silica gel chromatography column. Elution with 35% ethyl acetate in hexane provided various fractions which were combined according to the purities of the respective compounds. A total of 4.6 g of Compound B were isolated by chromatography. Fractions which were predominantly Compound B were crystallized from ethyl acetate/hexane providing a total yield of Compound B of 13.79 g. Rechromatography of fractions containing impure Compound C on silica eluting with 25% ethyl acetate in hexane provided 9.82 g of Compound C.