1-Ethyl-3-(3'-dimethylaminopropyl)carbodiimide → HCID 178500664, compound

Participants

Reaction Steps

Thiocarbonyl diimidazole (179 mg, 1.00 mmol) was added in one portion to a solution of aminopyrazine (96 mg, 1.00 mmol) in DMA (5 mL) and the solution was stirred at room temperature for 6 h. Methyl [trans-4-(4-{[hydrazino(oxo)acetyl]amino}phenyl)cyclohexyl]-acetate (Intermediate 43, 267 mg, 0.80 mmol) was added in one portion and the reaction mixture was stirred at room temperature for 20 h and then heated at 80° C. for 10 minutes in the microwave. The solution was cooled to room temperature and EDCI (192 mg, 1.00 mmol) was added in one portion and the reaction mixture was heated to 90° C. for 15 minutes in the microwave. The reaction mixture was cooled to room temperature and poured into water (200 mL). The mixture was filtered and the resulting solid was recrystallised (CH3CN) to give the title compound as an off white solid (35 mg, 8%); 1H NMR δ 1.15 (2H, m), 1.45-1.48 (2H, m), 1.79 (6H, m), 2.26 (2H, d), 2.45-2.49 (1H, m), 3.61 (3H, s), 7.23-7.25 (2H, d), 7.69-7.71 (2H, d), 8.36 (1H, d), 8.42 (1H, t), 9.19 (1H, s), 11.01 (1H, s); MS m/e MH+ 437.

Provenance & Evidence