Cyclopentylamine → 1-[(2-chloropyridin-4-yl)methyl]-3-[1-(N-cyclopentylglycyl)-3,3-dimethyl-2,3-dihydro-1H-indol-6-yl]-5,5-dimethylimidazolidine-2,4-dione

Participants

Reaction Steps

A solution of 3.423 g of 3-[1-(chloroacetyl)-3,3-dimethyl-2,3-dihydro-1H-indol-6-yl]-1-[(2-chloropyridin-4-yl)methyl]-5,5-dimethylimidazolidine-2,4-dione obtained in stage j) below in 42 mL of cyclopentylamine is heated at 70° C. for 4 hours. The reaction mixture is then concentrated under reduced pressure and the residue is taken up in 100 mL of water and extracted with three times 60 mL of ethyl acetate. The combined organic phases are then washed with water, dried over magnesium sulphate, filtered and concentrated under reduced pressure. The residue is purified by chromatography on a column of silica, eluting with a mixture of dichloromethane and methanol (95/5 by volume) to give 3.5 g of 1-[(2-chloropyridin-4-yl)methyl]-3-[1-(N-cyclopentylglycyl)-3,3-dimethyl-2,3-dihydro-1H-indol-6-yl]-5,5-dimethylimidazolidine-2,4-dione, the characteristics of which are as follows:

Provenance & Evidence