反应详情

Diethylamine (0.26 g, 2.67 mmol) was added a mixture of 2-(6-[N,N-bis(tert-butoxycarbonyl)amino]-4-methyl-pyridin-3-ylmethyl)-malonic acid monoethyl ester (1.0 g, 2.2 mmol) and 37% aq. solution of formaldehyde (0.24 g, 3.00 mmol) in methylene chloride (2 mL) at 0° C. The mixture was stirred for 16 h at room temperature and ethyl acetate was added. The organic layer was washed with water and 5% NaHCO3 and dried. Concentration under reduced pressure followed by flash chromatography (toluene/ethyl acetate, 3:1→1:1) gave 2-(6-[N,N-bis(tert-butoxycarbonyl)amino]-4-methyl-pyridin-3-ylmethyl)-acrylic acid ethyl ester (0.81 g, 88%).

1. washThe organic layer was washed with water and 5% NaHCO3
2. customdried
3. concentrationConcentration under reduced pressure