反应详情

To a solution of Example 226A (1.00 g, 3.92 mmol) in methanol (20 mL) at ambient temperature was added 2-amino-2-methyl-1-propanol (0.349 g, 3.92 mmol), acetic acid (0.90 mL, 15.7 mmol) followed by MP-cyanoborohydride (2.49 mmol/g; 1.5 g). After 2 hours, the mixture was filtered, concentrated and the residue partitioned between ether and 1N NaOH. The organic layer was extracted with 1N aquoues HCl (×2) and the organic phase discarded. The aqueous layer was neutralized with 1N NaOH and extracted with EtOAc. The EtOAc extract was dried and concentrated to provide 700 mg (54%) of the title compound. MS (DCI+) m/z 329 (M+H); 1H NMR (300 MHz, CDCl3) δ 8.10 (s, 1H), 7.97-7.90 (m, 1H), 7.73 (t, J=7.7 Hz, 1H), 7.64-7.54 (m, 2H), 7.48 (t, J=7.5 Hz, 1H), 7.22 (d, J=7.7 Hz, 1H), 3.95 (s, 2H), 3.42 (s, 2H), 1.18 (s, 6H), 0.39-0.25 (m, 9H).

1. filtrationthe mixture was filtered
2. concentrationconcentrated
3. customthe residue partitioned between ether and 1N NaOH
4. extractionThe organic layer was extracted with 1N aquoues HCl (×2)
5. extractionextracted with EtOAc
6. extractionThe EtOAc extract
7. customwas dried
8. concentrationconcentrated