HCID 71546983, compound → HCID 71547124, compound

Participants

Reaction Steps

The ester 39 (0.1 g, 0.02 mmol) was dissolved in MeOH-THE (10+10 mL) and aq NaOH (4 N, 5 mL) was added at room temperature. The reaction mixture was stirred at room temperature for 4 h. The solvent was removed on a rotary evaporator and the residue washed with 1 N HCl (30 mL) and extracted with CHCl3 (2×50 mL). The extract was dried over Na2SO4 and concentrated to afford pure 42 (0.075 g, 80%) which was obtained as a brown solid: mp 190-192° C. IR (KBr) 3350, 2973, 1692, 1645, 1619, 1578, 1520, 1364, 1164, 666 cm−1; 1H NMR (DMSO-d6, 300 MHz) δ 8.30 (d, J=8.7 Hz, 1H), 7.59 (m, 1H), 7.45 (m, 2H), 7.39 (m, 1H), 7.21 (dd, J=2.4, J=8.7 Hz, 1H), 7.12 (d, J=2.4 Hz, 1H), 7.07 (m, 1H), 4.40 (m, 2H), 3.90 (s, 2H), 3.09 (m, 2H), 1.86 (m, 2H), 1.33 (s, 9H); ESIMS (m/z, relative intensity) 500 (MNa+, 100); HRESIMS calcd for C26H27N3O6Na, 500.1798 (MNa+). found 500.1806 (MNa+); HPLC purity: 95.5% (MeOH—H2O, 75:25).

Provenance & Evidence