Ethylenediamine → 6-{4-[2-aminoethylcarbamoylpropyloxy]-3-chlorophenyl}-4,5-dihydro-3(2H)-pyridazinone

Participants

Reaction Steps

A solution of 4.5 g (13.3 mol) of 6-[4-carboethoxypropyloxy-3-chlorophenyl]-4,5-dihydro-3(2H)-pyridazinone (prepared as described in Example 23) in 12.0 g 199 mmol) of ethylenediamine is heated at 95° C. under N2 for 12 hrs. Volatiles are removed under vacuum and the residue recrystallized from EtOAc-methanol to give 3.65 g of 6-{4-[2-aminoethylcarbamoylpropyloxy]-3-chlorophenyl}-4,5-dihydro-3(2H)-pyridazinone as a white powder. Yield, 78%.

Provenance & Evidence