反应详情

0.68 g (1.87 mmol) methyl(Z,2E)-5-[1-(4-chlorophenyl)pyrazol-3-yl]oxy-2-methoxyimino-4-methyl-pent-3-enoate and E-isomer from the previous reaction have been dissolved in 3.0 ml THF. 2.0 ml 40% aqueous methylamine have been added at ambient temperature with stirring which was continued over night. After removal of the solvent in vacuo the mixture was purified by chromatography on silica with a heptane/ethyl acetate gradient. 90 mg of the desired Z-isomer have been collected. 1H-NMR (CDCl3): δ=2.03 (s); 2.85 (d); 3.97 (s); 4.64 (s); 5.87 (s); 6.02 (d); 6.65 (br); 7.35 (d); 7.50 (d); 7.67 (d).

1. waitwas continued over night
2. customAfter removal of the solvent in vacuo the mixture
3. customwas purified by chromatography on silica with a heptane/ethyl acetate gradient
4. custom90 mg of the desired Z-isomer have been collected