Reaction Steps
Following the procedure described for the synthesis of 13, staffing from 11 (200 mg, 0.43 mmol) and methylacryloyl chloride (89 mg, 0.86 mmol), the title compound (70 mg, 50%) was obtained as a colourless oil, after purification by LC (silica gel, hex-EtOAc, 2:1). HPLC [Column Novapack C18 (Waters), 3.9×150 mm, Φ=1 ml/min, λ=214 nm, eluent: ACN/0.05% TFA, (25/75)] Rt==6.38 min. 1H-NMR (200 MHz, CDCl3) δ 0.91 (t, J=6, 6H), 1.44 (m, 1H), 1.64-1.93 (m, 5H), 1.93 (s, 3H), 1.96-2.12 (m, 2H), 2.78 (m, 1H), 3.20 (m, 1H), 3.56-3.68 (m, 3H), 4.80 and 4.77 (2d, J=10, 1H), 5.16 (s, 2H), 5.19 (d, J=9, 2H), 7.32 (m, 5H). 13C-NMR (75 MHz, CDCl3) δ 19.8, 21.4, 23.0, 24.2, 24.9, 29.9, 37.1, 37.7, 41.1, 50.2, 53.2, 66.6, 67.4, 116.9, 128.1, 128.3, 128.4, 135.0, 141.7, 170.7, 174.1. ESI-MS Calcd for C24H32N2O4: 412.24. Found: 413.3 (M+H)+.
