反应详情

To a solution of methylhydroxylamine HCl salt (28 mg, 0.326 mmol) in anhydrous MeOH (8 mL) was added NaOMe (25 wt. % in MeOH, 15.83 mg, 0.294 mmol), followed by (E)-N-(6-hydroxy-2-phenylchroman-4-ylidene)cyanamide (86 mg, 0.326 mmol). After stirred 10 minutes, the solvent was removed in vacuum. The residue was dissolved in DCM (15 mL) and filtered, and the solvent was removed in vacuum to give the crude product, which was purified by preparative TLC to give 3′-amino-2′-methyl-2-phenyl-2′H-spiro[chroman-4,5′-[1,2,4]oxadiazol]-6-ol (20 mg, 20%). 1HNMR(CDCl3): 7.30-7.51 (m, 5H), 6.95 (s, 1H), 6.69 (m, 2H), 5.15 (t, 3H), 2.98 (s, 3H), 2.28 (d, 2H), 1.17 (s, 1H).

1. customthe solvent was removed in vacuum
2. dissolutionThe residue was dissolved in DCM (15 mL)
3. filtrationfiltered
4. customthe solvent was removed in vacuum
5. customto give the crude product, which
6. customwas purified by preparative TLC