Reaction of lysine with estrone 3,4-o-quinone.

Reaction of lysine with estrone 3,4-o-quinone gave a complex mixture of products. Six compounds were isolated and identified using spectroscopic techniques. Among the reaction products isolated were 4-hydroxyestrone (2), 3-aminoisoestrone (3), 3-(N-pentyl-5-amino)-isoestrone (4), 1-lysylestrone 3,4-o-iminoquinone (5), and two dimeric products of 3,4-catechol estrone (6 and 7).