1,4-Dioxane → 2-(4-{[tert-Butoxycarbonyl-(3-tert-butoxycarbonylamino-propyl)-amino]-methyl}-phenyl)-3-methoxy-acrylic acid methyl ester

Participants

Reaction Conditions

Reaction Steps

A mixture of (3-tert-butoxycarbonylamino-propyl)-[4-(4,4,5,5-tetramethyl-[1,3,2]dioxaborolan-2-yl)-benzyl]-carbamic acid tert-butyl ester (6.00 g, 12.25 mmol), 2-iodo-3-methoxy-acrylic acid methyl ester (4.45 g, 18.38 mmol), K3PO4 (7.79 g, 36.75 mmol), Pd(PPh3)4 (0) (0.68 g, 0.61 mmol), dioxane (60 mL) and water (12 mL) was degassed and heated at 80° C. for 20 h under argon atmosphere. The reaction mixture was diluted with EtOAc (500 mL), washed with water (300 mL) and brine (300 mL). The organic solution was concentrated and purified by flash chromatography (0%-30% EtOAc in heptane) to give desired product (5.35 g, 91%) as brown oil. 1NMR (300 MHz, CDCl3): δ 7.56 (s, 1H), 7.30 (d, J=8.1 Hz, 2H), 7.20 (br.d, 2H), 5.20 (br.s, 0.5H), 4.62 (br.s, 0.5H), 4.39 (br, 2H), 3.86 (s, 3H), 3.74 (s, 3H), 3.27 (m, 2H), 3.08 (m, 2H), 1.62 (m, 2H), 1.50 (br.d, 9H), 1.43 (s, 9H). LCMS (EI) m/z: 501 (M+Na+).

Provenance & Evidence