Dimethylformamide → 2-(4-Chlorophenoxy)benzeneacetyl chloride

Participants

Reaction Steps

[2-(4-chloro-phenoxy)-phenyl]-acetic acid (IX) (47.3 grams; 180 mmol) was suspended in toluene (140 ml) at 48° C. To this suspension dimethylformamide (4.0 ml) and SOCl2 (19.8 ml; 271 mmol; 1.5 eq) in toluene (18 ml) were added. After 10 min the reaction mixture was concentrated under vacuo and stripped twice with toluene, to yield a brownish oil of [2-(4-chlorophenoxy)-phenyl]-acetyl chloride. The oil was suspended in toluene (75 ml). To the suspension was added at 5° C. a solution of sarcosine methylester (30.3 grams 217 mmol) and triethylamine (57 ml) in a mixture of dimethylformamide (236 ml) and toluene (47 ml). The brownish suspension was stirred for 2 hours at room temperature. To the reaction mixture water (750 ml) was added and the mixture was extracted twice with ethyl acetate (500 ml). The organic phase was washed with saturated brine (700 ml) and dried on magnesium sulphate. The solvent was removed in vacuum to yield methyl-N-[2-(4-chloro-2-phenoxyphenyl)-1-oxethyl]-N-methylglycinate (X) (61.3 grams, 202 mmol) as a brownish oil.

Provenance & Evidence