Benzenemethanamine, 3,4-dichloro- → 5-(3,4-Dichlorobenzyl-carbamoyl)-thiophene-2-carboxylic acid ethyl ester

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Reaction Steps

Starting material (12(e)) was prepared as follows. To a stirring solution of 3,4-dichlorobenzylamine (0.53 mL; 4.0 mmole) in acetonitrile (10 mL) was added triethylamine (1.67 mL; 12.0 mmole) and a solution of (11(a)) (0.87 g; 4.0 mmole, see Example 11) in acetonitrile (20 mL). The solution was stirred at ambient temperature. under argon, for 22 hours. The solvent and excess triethylamine were removed in vacuo and the residue partitioned between chloroform and water. The organic phase was washed with water and brine, dried over magnesium sulphate and vacuumed to dryness to give 5-(3,4-dichlorobenzyl-carbamoyl)-thiophene-2-carboxylic acid ethyl ester (12(a)) as a cream solid ( 90%).

Provenance & Evidence