N,N-Dimethylethylenediamine → 2'-(2-Phenoxy-ethylsulfanylmethyl)-biphenyl 2-carboxylic acid (2-dimethylamino-ethyl)-amide

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Reaction Steps

2′-(2-Phenoxy-ethylsulfanylmethyl)-biphenyl-2-carboxylic acid (2-dimethylamino-ethyl)-amide was synthesized as described for 4′-(2-phenoxy-ethylsulfanylmethyl)-biphenyl-3-carboxylic acid (3-dimethylamino-propyl)-amide. 2′-(2-Phenoxy-ethylsulfanylmethyl)-biphenyl-2-carboxylic acid (0.8 g, 2.19 mmol, 1 eq.) in anhydrous THF was treated with 1,1′-carbonyldiimidazole (0.36 g, 2.23 mmol, 1.02 eq.) and warmed as described. The reaction was allowed to cool and then treated with N,N-dimethylethylenediamine (0.23 g, 2.63 mmol, 1.2 eq.). The reaction was treated as described in example 1 to give an orange/brown oil. The oil was purified by silica gel flash chromatography using 10% 2M NH3 in methanol in chloroform as the mobile phase. Fractions containing the product were pooled and the solvent removed in vacuo leaving 2′-(2-phenoxy-ethylsulfanylmethyl)-biphenyl 2-carboxylic acid (2-dimethylamino-ethyl)-amide (0.81 g, 85% yield) as a faint yellow oil.

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