Succinic anhydride → 4-Cyclohexyl-1-isopropylbutyl hydrogen succinate

100 mg of (S)-α-[(S)-α[(t-butylsulphonyl)methyl]-hydrocinnamamido]-N-[(1S,2R,3S)-1-(cyclohexylmethyl)-2,3-dihydroxy-4-methylpentyl]imidazole-4-propionamide, 200 mg of succinic anhydride and 200 mg of sodium carbonate in 10 ml of dimethylformamide are stirred at 50° overnight. Thereafter, the reaction mixture is taken up in ethyl acetate and the organic phase is washed with saturated ammonium chloride solution and water, dried and evaporated. Chromatography of the resiude on 20 g of silica gel with a 90:10:1:0.5 mixture of methylene chloride, methanol, water and acetic acid yields (1S,2R,3S)-3-[(S)-α-[(t-butylsulphonyl)methyl]-hydrocinnamamido]imidazole-4-propionamido]-4-cyclohexyl-1-isopropylbutyl hydrogen succinate as a foam, MS: 733 (M+H)+, and (1R,2S)-1-[(S)-1-[(S)-α-[(t-butylsulphonyl)methyl]hydrocinnamamido]imidazole-4-propionamide]-2-cyclohexylethyl]-2-isopropylethylene bis(hydrogen succinate) in the form of a foam, MS: 833 (M+H)+.

1. washthe organic phase is washed with saturated ammonium chloride solution and water
2. customdried
3. customevaporated
4. additionChromatography of the resiude on 20 g of silica gel with a 90:10:1:0.5 mixture of methylene chloride, methanol, water and acetic acid

ORD record

ord-a48b5474f5344f16972154bc426e72b7

Source dataset

uspto-grants-1995_02

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US05389616