Ethyl Acetate → 2-Methyl-propane-2-sulfinic acid[1-(6-chloro-pyridazin-3-yl)-1-methyl-ethyl]-amide

Participants

Reaction Conditions

Reaction Steps

Crude 2-methyl-propane-2-sulfinic acid[1-(6-chloro-pyridazin-3-yl)-eth-(E)-ylidene]-amide (56 mg, 0.22 mmol) was dissolved in dry THF (2.2 mL) and cooled to −20° C. under an atmosphere of inert gas. Methylmagnesium bromide (1.0 M in MePh/THF, 0.26 mL, 0.26 mmol) was added in one portion via syringe and the reaction was stirred −20° C. for 1.5 h. To the reaction mixture was added saturated aqueous NH4Cl (4 mL) and EtOAc (7 mL). The layers were separated and the aqueous layer was extracted with EtOAc (2×5 mL). The combined organic layers were dried over Na2SO4, concentrated and then purified by flash chromatography (silica, 0→4% MeOH/CH2Cl2). 15 mg of impure 2-methyl-propane-2-sulfinic acid[1-(6-chloro-pyridazin-3-yl)-1-methyl-ethyl]-amide was isolated as a light brown solid. This material was used without further purification.

Provenance & Evidence