Dicyclohexylcarbodiimide → HCID 70058166, Verbindung

A solution of 90mg (0.26 mmol) of 2(S)-[3(S)-amino-2(R)-hydroxy-4-phenylbutyl]-N-tert.butyl-1(R)-cyclohexanecarboxamide in 4 ml of dichloromethane was added to a mixture of 65 mg (0.26 mmol) of N-benzyloxycarbonyl-cyano-L-alanine, 35 mg (0.23 mmol) of hydroxybenzotriazole hydrate and 54 mg (0.26 mmol) of dicyclohexylcarbodiimide in 2 ml of dimethylformamide. The mixture-was stirred under nitrogen at room temperature for 18 hours and then filtered. The filtrate was evaporated and the residue was partitioned between 25 ml of ethyl acetate and 10 ml of saturated aqueous sodium hydrogen carbonate solution. The organic layer was dried over anhydrous magnesium sulphate and evaporated. The crude product was chromatographed on a column of silica gel using 3% methanol in dichloromethane for the elution and the product was purified further by crystallization from a mixture of 1 ml of dichloromethane and 10 ml of hexane. There were obtained 68 mg of 2(S)-[3(S)-[[N-(benzyloxycarbonyl)-3-cyano-L-alanyl]amino]-2(R)-hydroxy-4-phenylbutyl]-N-tert.butyl-1(R)-cyclohexanecarboxamide as a white solid; MS m/e 577 [M+H]+.

1. filtrationfiltered
2. customThe filtrate was evaporated
3. customthe residue was partitioned between 25 ml of ethyl acetate and 10 ml of saturated aqueous sodium hydrogen carbonate solution
4. dry with materialThe organic layer was dried over anhydrous magnesium sulphate
5. customevaporated
6. customThe crude product was chromatographed on a column of silica gel using 3% methanol in dichloromethane for the elution
7. customthe product was purified further by crystallization from a mixture of 1 ml of dichloromethane and 10 ml of hexane

ORD-Eintrag

ord-693b5c0b536e4693bf4f224dd1c28134

Quelldatensatz

uspto-grants-1996_12

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US05583248