Diisopropylethylamine → HCID 86702755, compound

Participants

Reaction Steps

300 mg of methyl (S)-2-[(2S,3S)-2-((3S,4S)-4-amino-3-benzyloxycarbonylamino-5-phenylpentanoylamino)-3-methylpentanoylamino]-3-methylbutyrate (hydrochloride), 170.1 mg of (S)-3,3-dimethyl-2-[(S)-4-methyl-2-(3-methylbutyrylamino)pentanoylamino]butyric acid and 163.4 l of ethyldiisopropylamine were dissolved in about 10 ml of DMF in a flask with ice cooling, 197.0 mg of HATU (C10H15N6O*PF6) were added, and the mixture was stirred at RT overnight. The yellow reaction mixture was poured into saturated sodium hydrogencarbonate solution and stirred for 15 min. The precipitate formed was filtered off with suction, triturated with dilute formic acid, filtered off with suction again, washed with water and dried, giving 340 mg of methyl (S)-2-[(2S,3S)-2-((3S,4S)-3-benzyloxycarbonylamino-4-{(S)-3,3-dimethyl-2-[(S)-4-methyl-2-(3-methylbutyrylamino)pentanoylamino]butyrylamino}-5-phenylpentanoylamino)-3-methylpentanoylamino]-3-methylbutyrate as a white solid. (Yield 82%). MS-FAB (M+H+)=880.1 Rf (polar method): 2.91 min.

Provenance & Evidence