Sodium borohydride → HCID 11340988, compound

Participants

Reaction Steps

The product from Example 136C (46 mg, 0.12 mmol) in ethanol (2 mL) and tetrahydrofuran (0.5 mL) was treated with sodium borohydride. The mixture was concentrated and passed through a short column of silica with a gradient of 2 to 10% MeOH/CH2Cl2. The resulting residue rinsed with ether, dissolved into methanol (1 mL), treated with 0.1 M aqueous hydrochloric acid (0.2 mL) heated at 60□ C for three hours, treated with more 0.1 M aqueous hydrochloric acid (0.05 mL), heated at 60□ C for one hour, concentrated, and chromatographed through a short column of silica with a gradient of 2 to 10% 2 M NH3 in MeOH/CH2Cl2 to provide the title compound as a white powder (11% yield). 1HNMR (300 MHz, CD3OD) δ 1.17 (d, 3 H), 1.4-1.54 (m, 1 H), 1.49 (d, 3 H), 1.73-1.86 (m, 2 H), 1.95-2.08 (m, 1 H), 2.24-2.36 (m, 1 H), 2.43-2.60 (m, 2 H), 2.93-3.14 (m, 2 H), 3.19-3.33 (m, 2H), 4.89 (q, 1 H), 6.59 (s, 1 H), 7.32 (ddd, 1 H), 7.39 (dd, 1 H), 7.45-7.47 (m, 2 H), 7.49 (ddd, 1 H), 7.62 (m, 1 H), 7.71 (dd, 1 H).

Provenance & Evidence