HCID 86608958, Verbindung → HCID 68408133, Verbindung

At −78° C. a solution of methyl lithium (1.6M in diethyl ether, 25 ml, 40 mmol) was added dropwise to a solution of 2-amino-3,6-dichloro-N-methoxy-N-methyl-benzamide (2.5 g, 10 mmol) in tetrahydrofurane (100 ml). After complete addition, the reaction was warmed to r.t. The dark solution was stirred for 3 hours at room temperature. Under ice cooling 2N aqueous hydrochloride solution (25 ml) was added dropwise and stirred at r.t. for 30 minutes. The reaction was diluted with water, extracted twice with ethyl acetate. The combined organic layers were washed with saturated aqueous sodium chloride solution, dried over sodium sulfate, filtered, and the solvent was evaporated. The residue was purified by column chromatography (silica gel, solvent gradient n-heptan/ethyl acetate=3/7) to yield the title compound as an orange oil (0.59 g, 29%).