Triethylamine → Tert-butyl{2-[3-(pentanoyl-phenethyl-amino)-propylsulfanyl]-benzoimidazol-1-yl}-acetate

Participants

Reaction Steps

[3-(1-tert-Butoxycarbonylmethyl-1H-benzoimidazol-2-ylsulfanyl)-propyl]-phenethyl-ammonium chloride (Precursor U-01b, 11.6 mg, 0.025 mmol) and Et3N (12.2 mg, 17.2 μl, 0.1 mmol) are dissolved in 1,2-dichloroethane (0.2 ml). To this solution is added valerylchloride (9 mg, 8.95 μl, 0.075 mmol) and the stirring is continued for 2 h. Then 1,2-dichloroethane (0.4 ml) and tris-(2-aminoethyl)amine polystyrene (3.4 mmol/g, 22 mg, 0.075 mmol) are added. After 30 min of shaking the resin is filtered off. Then methylisocyanate polystyrene (2.5 mmol/g, 30 mg, 0.075 mmol) is added as well as 1,2-dichloroethane (0.5 ml) and the resulting suspension is stirred for 2 h. It is filtered and the organic filtrate is washed with an aqueous KH2PO4 solution (pH=4) and water. Finally the organic phase is dried over Na2SO4 and evaporated to dryness yielding the title compound: tR=2.62 min (LC-2), ESI-MS (pos.): m/z 510.49 [M+H]+; 1H-NMR (DMSO-d6 at 100° C.): δ (ppm) 0.80 (t, 3H, CH2CH3), 1.19 (m, 2H, CH2CH3), 1.37 (m, 2H, CH2CH2CH3), 1.40 (s, 9H, tBu), 1.91 (m, 2H, CH2CH2N), 2.08 (m, 1H, COCHa), 2.24 (m, 1H, COCHb), 2.71-2.83 (m, 2H, CH2Ph), 3.30 (m, 2H), 3.32-3.43 (m, 4H), 4.98 (m, 2H, CH2CO2), 7.12-7.26 (m, 7 Harm), 7.50 (m, 2Harom).

Provenance & Evidence