Diisopropylethylamine → HCID 58116486, compound

Participants

Reaction Steps

226 mg (0.52 mmol) of the compound from Example 40A and 109 mg (1.05 mmol) of ethyl N′-hydroxyimidocarbamate [G. Zinner, G. Nebel, Arch. Pharm. 1970, 303, 385-390] were initially charged in 2.0 ml of DMF and reacted with 298 mg (0.8 mmol) of HATU and 0.27 ml (203 mg, 1.6 mmol) of N,N-diisopropylethylamine. The mixture was stirred at RT for 15 minutes and then the reaction mixture was partitioned between water and ethyl acetate. The organic phase was washed repeatedly with water, dried over sodium sulphate and concentrated under reduced pressure. The residue was taken up in 5.0 ml of dioxane and admixed with about 1 g of 4 Å molecular sieve. The mixture was heated to reflux for 16 h, and the reaction mixture was purified by means of preparative HPLC. Yield: 86 mg (30% of theory)

Provenance & Evidence