Tert-Butylamine → HCID 9865086, compound

Participants

Reaction Conditions

Reaction Steps

A solution of (1R, 2S, 3S, 5S)-5-(2-bromo-5,6-dichloro-1H-benzimidazol-1-yl)-3-(hydroxymethyl)-1,2-cyclopentanediol (500 mg, 1.26 mmole) was stirred in tert-butylamine (Aldrich, 98%, 20 mL) in a Parr bomb maintained at 148 ° C. (oil bath) for 48 hours. The bomb was cooled and the resulting pale yellow solution diluted with ethanol containing 1 N sodium hydroxide (1.2 mL). Volatiles were evaporated in vacuo and the residue was chromatographed on silica gel. Title compound was eluted with 10% methanol-chloroform as a colorless oil. The oil was dissolved in absolute ethanol, concentrated to an oil, and triturated with water (3 mL) to give (1R, 2S, 3S, 5S)-5-[2-(tert-butylamino)-5,6-dichloro-1H-benzimidazol-1-yl]-3-(hydroxymethyl)-1,2-cyclopentanediol as white powder (303 mg, 61%), m.p.: collapses to glass at 116-150° C.; 1H-NMR(DMSO-d6) δ: 7.63 and 7.43 (both s, 2, aromatic CH), 6.15 (s, 1, NH), 5.08 (t, J=4.3 Hz, 1, OH), 4.85 (d,J=7.4 Hz, 1, OH), 4.71 (d, J=3.8 Hz, 1, OH), 4.7-4.5 (m, 1, NCH), 4.45-4.3 (m, 1, OCH), 3.80 (m, 1, OCH), 3.7-3.4 (m, 2, OCH2), 2.2-1.85 (m, 3, CH2 and CH of cyclopentane), 1.47 (s, 9, 3 CH3); mass spectrum (CI): 388(M+1); [α]20 589-4.0°, [α]20 578-4.3°, [α]20 546-6.0°, [α 20 436-22.6°, [α]20 365-82.1° (c=0.420, methanol). [See Examples 25-28, 30 and 31]

Provenance & Evidence