Water → (e)-Methyl 4-(benzyl(2-(tritylamino)ethyl)amino)but-2-enoate

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To a solution of Example 12A (128 g, 326 mmol) in acetonitrile (652 mL) was added (E)-methyl 4-bromobut-2-enoate (38.4 mL, 326 mmol) and potassium carbonate (90 g, 652 mmol), and the mixture was heated at 50° C. for 17 hours. A small amount of water was added, and the mixture was decanted into a separatory funnel. The solid left behind was washed three times with ethyl acetate, and the ethyl acetate washings were added to the separatory funnel followed by more water. The layers were separated and the organic layer was concentrated, then dissolved in dichloromethane and loaded onto a silica gel column packed in hexanes. The product was eluted with 15% ethyl acetate/hexanes to afford the title compound. 1H NMR (500 MHz, DMSO-d6) δ ppm 7.38 (d, J=7.3 Hz, 5H), 7.31-7.12 (m, 15H), 6.83 (dt, J=5.6 Hz, 15.7 Hz, 1H), 6.07 (d, J=15.7 Hz, 1H), 3.67 (s, 3H), 3.42 (s, 2H), 3.05 (d, J=4.4 Hz, 2H), 2.58-2.49 (m, 2H), 2.11 (dd, J=6.2 Hz, 12.9 Hz, 2H).

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