Isopropylamine → HCID 56627375, compound

Participants

Reaction Steps

(1R, 2S, 3S, 5S)-3-(Acetoxymethyl)-5-(2-bromo-5,6-dichloro-1H-benzimidazol-1-yl)-1,2-cyclopentanediyl diacetate (1.00 g, 1.92 mmole) was refluxed in ethanol (10 mL) with isopropylamine (1.6 mL, Fluka) under nitrogen for 24 hours. A second portion of isopropylamine (0.80 mL) was added and reflux continued for an additional 4 hours. Volatiles were evaporated, the residue was redissolved in ethanol, 1N sodium hydroxide (1.90 mL) was added, and volatiles were reevaporated. The residue was chromatographed on a silica gel column. Title compound was eluted with 10% methanol-ethyl acetate as a colorless glass. Concentration of an ethanol solution gave title compound as a off-white solid foam (360 mg, 46%). Such a sample was solidified by trituration with 95% water-5% methanol to give title compound as white powder (96%), m.p. 137°-138° C.; 1H-NMR(DMSO-d6)δ: 7.60 and 7.39 (both s, 2, aromatic CH), 6.64 (d, J=7.4 Hz, 1, NH), 5.14 (t, J=4.3 Hz, 1, OH), 4.81 (d, J=7.3 Hz, 1, OH), 4.70 (d, J=3.5 Hz, 1, OH), 4.70-4.50 (m, 1, NCH), 4.50-4.30 (m, 1, OCH), 4.10-4.00 (m, 1, NCH of cyclopropylamino), 3.9-3.75 (m, 1, OCH), 3.70-3.50 (m, 2, OCH2), 2.20-1.80 (m, 3, CH2 and CH of cyclopentane), 1.24 (d, J=6.6 Hz, 6, 2 CH3); mass spectrum (CI): 374(M+1); [α]20589 -3.72°, [α]20578 -2.60°, [α]20546 -2.23°, [α]20436 -9.67°, [α]20365 -51.7° (c=0.269, methanol).

Provenance & Evidence