Hydrochloric Acid → HCID 66833333, compound

Participants

Reaction Steps

2-Amino-2-{2-[benzyl-(2-hydroxyethyl)-amino]-ethyl}-6-borono-hexanoic acid dihydrochloride is prepared in a manner analogous to that set forth in Example 16, except 2-(benzylamino)ethanol is used as the amine in step 6. The final step is as follows: a solution of 2-{2-[benzyl-(2-hyrdoxyethyl)-amino]-ethyl}-2-tert-butoxycarbonylamino-6-(4,4,5,5-tetramethyl-[1,3,2]-dioxa-borolan-2-yl)-hexanoic acid ethyl ester (111 mg) in 6 N hydrochloric acid (6 mL) was stirred at 95° C. overnight. After cooling to room temperature, the reaction mixture was transferred to a separatory funnel, diluted with deionized water (5 mL) and washed with dichloromethane (3×). The aqueous layer was frozen in liquid nitrogen and lyophilized to give the title compound as a colorless foam (48 mg); 1H NMR (D2O, 300 MHz) δ 7.35 (s, 5H), 4.11-4.25 (m, 2H), 3.76 (s, 2H), 3.06-3.34 (m, 4H), 2.18 (m, 2H), 1.76 (m, 1H), 1.43 (m, 1H), 1.18 (m, 4H) and 0.56 (m, 2H); MS (+CI): m/z for C17H29BN2O5: expected 352.2. found 371.2 (M+H+H2O)+353.2 (M+H)+, 335.2 (M+H—H2O)+.

Provenance & Evidence