Triphenylphosphine → HCID 59759128, compound

Participants

Reaction Steps

To a solution of 2-{[4-(2-hydroxyethyl)-1,3-thiazol-2-yl]thio}-2-methylpropionic acid tert-butyl ester (2.7 g) synthesized in Example 4 in tetrahydrofuran (15 ml) were added triphenylphosphine (2.5 g) and 4-(4-nitrophenyl)phenol (12.1 g), and the mixture was stirred under ice-cooling for 5 min. To the solution was added diisopropyl azodicarboxylate (40% toluene solution, 4.7 ml), and the mixture was stirred at room temperature overnight. To the solution were further added triphenylphosphine (1.2 g) and diisopropyl azodicarboxylate (40% toluene solution, 2.4 ml), and the mixture was stirred at room temperature for 3.5 hr. The reaction mixture was concentrated, extracted with ethyl acetate. The organic layer was washed with aqueous sodium hydroxide solution and saturated brine, and dried over anhydrous magnesium sulfate. The solvent was evaporated under reduced pressure and the obtained residue was purified by silica gel chromatography (elution solvent; hexane:ethyl acetate=1:1) to give the title compound (3.3 g) as a pale-brown solid.

Provenance & Evidence