Propionic Acid → HCID 178460509, compound

Participants

Reaction Steps

Following the general procedure for the one pot synthesis, tranexamic acid (786 mg, 5.0 mmol) was reacted with chlorotrimethylsilane (1.396 mL, 1.195 g, 11.0 mmol) in anhydrous dichloromethane (10 mL) and in the presence of N-methylmorpholine (1.374 mL, 1.264 g, 12.5 mmol). Subsequent reaction of the intermediate with chloroethylchloroformate (0.82 mL, 1.07 g, 7.5 mmol) followed by a mixture of NMM (2.75 mL, 2.53 g, 25 mmol) and propionic acid (3.73 mL, 3.70 g, 50 mmol) yielded the title compound 9 (103 mg, 7% yield) as colorless, very viscous oil after aqueous work-up and two mass-guided preparative HPLC purifications. 1H NMR (400 MHz, DMSO-d6): δ=0.82-0.94 (br. m, 2H), 1.03 (t, J=7.6 Hz, 3H), 1.17-1.35 (br. m, 3H), 1.38 (d, J=5,2 Hz, 3H), 1.65-1.73 (br. m, 2H), 1.83-1.91 (br. m, 2H), 2.09 (tt, J=12.4, 3.6 Hz, 1H), 2.26-2.33 (m, 2H), 2.74-2.90 (m, 2H), 6.64 (q, J=5.6 Hz, 1H), 7.44 (t, J=5.6 Hz, 1H), 11.99 (br. s, 1H). MS (ESI) m/z 324.14 (M+Na)+; 300.10 (M−H)−.

Provenance & Evidence