Diisopropylethylamine → HCID 178459929, compound

Participants

Reaction Steps

(2S,4S)-5-Biphenyl-4-yl-4-t-butoxycarbonylamino-2-hydroxymethyl-pentanoic acid (50 mg, 120 μmol, 1.0 eq.), DMA (1 mL), DIPEA (0.13 mL) and 1-chloroethyl isopropyl carbonate (83 mg, 0.5 mmol, 4.0 eq.) were combined. The reaction vessel was capped and microwaved at 80° C. for 2 hours. The mixture was dried under vacuum, dissolved in MeCN (2 mL), and combined with 4 M of HCl in dioxane (500 μL). The resulting mixture was stirred at room temperature for 30 minutes. The precipitate was filtered and discarded, and the filtrate containing the intermediate was concentrated down and submitted to the next step. 1,2,3-Triazole-4-carboxylic acid (14 mg, 120 μmol, 0.5 eq.) and HATU (48 mg, 120 μmol, 1.0 eq) were dissolved in DMF (1 mL) and the resulting solution was stirred for 5 minutes, followed by the addition of DIPEA (44 μL) and the intermediate from last step. The mixture was stirred for 5 minutes. The reaction was quenched with water and the product dried under vacuum. The product was then purified by preparative HPLC to yield the title compound (6 mg; purity 95%). MS m/z [M+H]+ calc'd for C27H32N4O7, 525.23. found 525.4.

Provenance & Evidence