반응 #81857

반응 방정식

Et3SiH

trifluoroacetic acid

ClCH2CH2Cl

9a

3-[(Acetyloxy)methyl]-7-[[[2-(2-hydroxyphenyl)-4-thiazolyl]acetyl]amino]-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic Acid

→

9b

수율 35.0%

3-Chloro-7-[[[2-(2-hydroxyphenyl)-4-thiazolyl]acetyl]amino]-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic Acid

수율 35.0%

반응 조건

실험 절차

The procedure used for the preparation of 9a was repeated with 8b (390 mg, crude from previous reaction), Et3SiH (0.80 mL, 5.0 mmol), and trifluoroacetic acid (1.50 mL, 19.5 mmol ) in dry ClCH2CH2Cl (8 mL ) at 0° C. under nitrogen to give 9b (50.0 mg, 35% for two steps) as a white solid after chromatographic separation on RP C-18 (gradient CH3CN/H2O: 25-30%, containing 1% HOAc). mp 155° C. (dec); IR (KBr) 3600-2800 (br), 3280, 1780, 1661 cm-1 ; 1H NMR (DMSO-d6) δ3.63 (1H, d, J=18.0 Hz), 3.74 (2H, s, CH2), 3.93 (1H, d, J=18.0 Hz), 5.15 (1H, d, J=4.7 Hz), 5.70 (1H, dd, J=8.0 and 4.7 Hz), 6.88 (1H, t, J=7.7 Hz), 6.96 (1H, d, J=7.7 Hz), 7.25 (1H, t, J=7.7 Hz), 7.40 (1H, s), 7.94 (1H, d, J=7.7 Hz), 9.16 (1H, d, J=8.0 Hz, NH), 11.30 (1H, s, OH), 13.80 (1H, br s, CO2H); FDMS m/z 451 (M+, 35Cl), 452 (M+ +1, 35Cl), 453 (M+, 37Cl), 454 (M+ +1, 37Cl); Anal. Calcd for C18H14ClN3O5S2 : C, 47.84; H, 3.12; N, 9.30. Found: C, 48.12; H, 3.16; N, 9.36

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