反应详情

A solution of (E)-3-(7-oxo-5,6,7,8-tetrahydro-[1,8]naphthyridin-3-yl)acrylic acid tert-butyl ester (0.86 g, 3.0 mmol) was stirred in methanol (10 mL), dioxane (10 mL) and aq. NaOH (15 mL of a 1 N solution, 15 mmol) for 4 days. The clear solution was neutralized with aq. HCl (15 mL of a 1 N solution, 15 mmol) and stirred for 20 min. The white precipitate was collected by filtration to give (E)-3-[6-amino-5-(2-carboxy-ethyl)pyridin-3-yl]acrylic acid (0.57 g, 78%): MS (ESI) m/e 237 (M+H)+.

1. filtrationThe white precipitate was collected by filtration