Potassium Carbonate → HCID 18697443, compound

Participants

Reaction Steps

To N,N'-bis-(2-(4-methoxybenzylthio)-2-methylpropyl)-ethylenediamine (4.13 g, 8.66 mmol) in CH3CN (50 mL)was added K2CO3 (1.21 g, 8.75 mmol, 101 mol %) followed by ethyl 5-bromovalerate (2.80 mL, 17.7 mmol, 204 mol %). The reaction was stirred at reflux overnight and was then concentrated to a paste in vacuo. The residue was partitioned between ethyl acetate (100 mL) and 0.5M KOH (100 mL). The aqueous layer was extracted with ethyl acetate (1×50 mL)and the combined organic layers were washed with NaCl solution (50 mL), dried with Na2 SO4 and concentrated to a yellow oil (~6 g). Purification by normal-phase preparative HPLC (100% CHCl3 to 5% methanol/chloroform over 25 min.) afforded pure title compound (1.759 g, 34% yield). FABMS analysis gave an (MH+) of 605 (compared with the value of 604.90 calculated for C33H52N2O4S2). Nuclear magnetic resonance characterization experiments yielded the following molecular signature: 1H NMR (300 mHz, CDCl3): δ7.25 (d, 4H, J=8.5), 6.83 (d, 4H, J=8.5), 4.13 (q, 2H, J=7), 3.793 (s, 3H), 3.789 (s. 3H), 3.74 (s, 2H), 3.67 (s, 2H), 2.6 (m, 10H), 2.31 (t, 2H, J=7), 1.6 (m, 2H), 1.5 (m 2H), 1.34 (s 12H), 1.28 (t, 3H, J=7).

Provenance & Evidence