Hydrochloric Acid → methyl alpha-(4-(N-methylcarbamyl)aminosulfonyl-2-n-propylphenoxy)-3,4-methylenedioxyphenylacetate

Participants

Reaction Steps

To a stirred solution of 500 mg (1.23 mmol) of methyl α-(4-aminosulfonyl-2-n-propylphenoxy)-3,4-methylenedioxyphenylacetate (the product of Example 100, Step C) in dry dimethylformamide (2 mL) was added 80 μL (1.35 mmol) of methyl isocyanate followed by 6 mg (0.06 mmol) of cuprous chloride. The reaction mixture was stirred overnight, after which TLC analysis (5% methanol/methylene chloride) indicated the reaction had not proceeded to completion. Subsequently, an additional 80 μL (1.35 mmol) of methyl isocyanate, 6 mg (0.06 mmol) of cuprous chloride as well as 342 μL (2.46 mmol) of triethylamine was added and the reaction mixture was again stirred overnight. TLC analysis (5% methanol/methylene chloride) indicated the reaction had proceeded to completion. The reaction mixture was poured into 1N HCl and extracted with ethyl acetate. The extract was washed with brine, dried over magnesium sulfate, filtered and the filtrate concentrated in vacuo and dried to afford 570 mg (100%) of the title compound as an amorphous solid.

Provenance & Evidence