m-Chloroperbenzoic acid → 5-Methyl-3-(pyridine-2-sulfonyl)-8-oxa-3-aza-bicyclo[5.1.0]octane

関与物質

反応手順

To the solution of 3-methyl-1-(pyridine-2-sulfonyl)-2,3,4,7-tetrahydro-1H-azepine (1.3 g, 5.16 mmol) in CH2Cl2 (50 ml) was added NaHCO3 (1.3 g, 15.5 mmol) and then mCPBA (2.67 g, 15.5 mmol) in portions. Stirred at RT for 4 h before worked up by washing with 15% NaOH, saturated K2CO3 and brine. Dried over Na2SO4. The reaction mixture was concentrated by rotary evaporation and two insomers were seperated on column chromatography (30%-40% EtoAc/Hexane). The first elution (trans-isomer, 230 mg) was used in next steps, the second elution (cis-insomer 200 mg) was saved: MS (M+H+): 269.0; 1H-NMR (400 Hz, CDCl3): d=8.70(d, 1H), 8.0-7.75(m, 2H), 7.50 (m, 1H) 4.39(m, 1H), 3.92(m, 1H), 3.34-2.00(m, 6H), 1.40(m, 1H), 0.88(d, 3H)

情報源と証拠