Pyridine → (E)-2'-(3-chloropropylsulphonyl)-2(R)-[1(S)-[(tetrahydro-2(RS)-pyranyloxy)carbamoyl]-4-phenyl-3-butenyl]-2'-isobutyl-4-methylvalerohydrazide

Participants

Reaction Steps

A solution of 0.918 g of (E)-2(R)-[1(S)-[(tetrahydro-2(RS)-pyranyloxy)carbamoyl]-4-phenyl-3-butenyl]-2′-isobutyl-4-methylvalerohydrazide in 10 ml of dichloromethane was treated with 0.202 ml of pyridine and 0.354 g of 3-chloropropanesulphonyl chloride. The mixture was stirred for 2 hours at room temperature. A further 0.177 g of 3-chloropropanesulphonyl chloride and 0.160 ml of pyridine were added and the mixture was stirred for a further 2 hours at room temperature. Evaporation gave a residue which was dissolved in ethyl acetate and washed in sequence with water, 5% aqueous citric acid, water, 5% aqueous sodium hydrogen carbonate and saturated aqueous sodium chloride. Drying over anhydrous magnesium sulphate, evaporation, and trituration with ether/hexane gave a residue which was purified by column chromatography on silica gel using hexane/ethyl acetate (6:4) for the elution, to give 0.8 g of (E)-2′-(3-chloropropylsulphonyl)-2(R)-[1(S)-[(tetrahydro-2(RS)-pyranyloxy)carbamoyl]-4-phenyl-3-butenyl]-2′-isobutyl-4-methylvalerohydrazide in the form of a pale yellow solid.

Provenance & Evidence