Pyridine → methyl (E)-3-[2(R)-[1(S)-(tertbutoxycarbonyl)-4-phenyl-3-butenyl]-4-methylvaleryl]-2-isobutylcarbazate

Participants

Reaction Conditions

Reaction Steps

0.50 g of (E)-2(R)-[1(S)-(tertbutoxycarbonyl)-4-phenyl-3-butenyl]-2′-isobutyl-4-methylvalerohydrazide and 0.12 ml of pyridine were dissolved in 10 ml of dichloromethane and cooled to 0° C. under nitrogen. 0.12 ml of methyl chloroformate and a few crystals of 4-dimethylaminopyridine were added in succession and the mixture was left to come to room temperature and then stirred for 1 hour. The mixture was diluted with dichloromethane and then washed in succession with 5% aqueous sodium hydrogen carbonate solution, water, 2M aqueous hydrochloric acid and water and then dried over magnesium sulphate. The solvent was evaporated to give 0.54 g of methyl (E)-3-[2(R)-[1(S)-(tertbutoxycarbonyl)-4-phenyl-3-butenyl]-4-methylvaleryl]-2-isobutylcarbazate in the form of a white foam.

Provenance & Evidence