Hydrochloric Acid → HCID 58249280, compound

Participants

Reaction Steps

(S)-2-[(S)-4-tert-Butoxycarbonyl-4-(17-tert-butoxycarbonylheptadecanoylamino)butyrylamino]-pentanedioic acid 5-tert-butyl ester 1-(2,5-dioxopyrrolidin-1-yl)ester (4 g, 4.77 mmol) was dissolved in acetonitrile (30 mL) and added to a solution of H-Glu-OtBu (1.07 g, 5.25 mmol) in Na2CO3 (0.1 M, 20 mL). The mixture was stirred at RT for 1 h, then neutralised with HCl (2M) to pH 7 and evaporated in vacuo. The residual oil was subsequently partitioned between ethyl acetate and HCl (0.1 M). The organic layer was dried (MgSO4), filtered and evaporated to dryness in vacuo. The residue (4 g) was dissolved in acetonitrile and treated with active carbon. After filteration and evaporation to dryness followed by drying overnight in vacuo, 2.8 g of (S)-2-{(S)-4-tert-Butoxycarbonyl-4-[(S)-4-tert-butoxycarbonyl-4-(17-tert-butoxycarbonylheptadecanoylamino)butyrylamino]butyrylamino}pentanedioic acid 1-tert-butyl ester was obtained as a crystalline solid. LC-MS (electrospray): m/z=927 (M+1).

Provenance & Evidence