Acetic Acid → HCID 19783238, compound

Participants

Reaction Conditions

Reaction Steps

A mixture of 3.07 g (5.79 mmol) of ethyl 3-[[2'-(N-t-butylsulfamoyl)biphenyl-4-yl]methyl]-2-methoxyimino-4-oxooctanoate (from Step F), 5.00 g (22.3 mmol) of 2-chloro-5-nitrophenylhydrazine hydrochloride [prepared from 2-chloro-5-nitroaniline according to H. Stroh and G. Westphal, Chem. Ber., 96, 184 (1963)], 55 mL of glacial acetic acid, and 25 mL of 2-methoxyethanol was stirred under N2 at 105° C. for 20 hours. The cooled mixture was concentrated in vacuo and the residue was partitioned between 200 mL of 0.2N HCl and 200 mL of ethyl acetate. The organic layer was washed with H2O (200 mL), dried over Na2SO4, filtered, and concentrated. Flash chromatography of the residue twice on silica gel (first column eluted with 2% MeOH in CH2Cl2, second column eluted with 1% MeOH in CH2Cl2) to provide 1.71 g (47%) of the title compound as a viscous, orange oil; homogeneous by TLC in 98:2 CH2Cl2 --MeOH; mass spectrum (FAB) m/e 598 (M+1)+. 400 MHz 1H NMR (CDCl3) δ0.87 (t, J=7.3 Hz, 3H), 1.06 (t, J=7.1 Hz, 3H), 1.34 (m, 2H), 1.59 (m, 2H, partially obscured by H2O peak), 2.62 (t, J=7.8 Hz, 2H), 4.10 (s, 2H), overlapping 4.14 (q, J=7.0 Hz, 2H), 4.24 (s, 2H), 7.26 (d, J=8.2 Hz, 2H), 7.32 (dd, J=7.5, 1.3 Hz, 1H), 7.41 (d, J=8.2 Hz, 2H), 7.49 (m, 1H), 7.58 (m, 1H), 7.66 (d, J=8.8 Hz, 1 H), 8.14 (dd, J=7.9, 1.3 Hz, 1H), 8.26 (dd, J=8.8, 2.7 Hz, 1H), 8.36 (d, J=2.6 Hz, 1H).

Provenance & Evidence