反应详情

Step N (1): (S)-Methyl 2-(methylamino)pent-4-enoate from Step G (1) and 3-ethoxythiophene-2-carboxylic acid were coupled according to the procedure outlined in Step A (1). The product was purified using silica gel column chromatography to provide 80 mg (quantitative yield) of (S)-methyl 2-(3-ethoxy-N-methylthiophene-2-carboxamido)pent-4-enoate. LC-MS (M+H)+=298.29; 1H NMR (300 MHz, CDCl3) δ ppm 1.32 (t, J=6.77 Hz, 3H) 2.48-2.64 (m, 1H) 2.68-2.82 (m, 1H) 3.01 (s, 3H) 3.72 (s, 3H) 4.06 (q, J=6.83 Hz, 2H) 5.00-5.20 (m, 3H) 5.63-5.84 (m, 1H) 6.70 (d, J=5.49 Hz, 1H) 7.29 (d, J=5.49 Hz, 1H).

1. customThe product was purified