Tetrahydrofuran → HCID 71227776, Verbindung
Reaktionsgleichung
[NH2:1][CH2:2][C@:3]1([OH:21])[CH2:8][CH2:7][CH2:6][C@H:5]([CH2:9][N:10]2[C:14]3[CH:15]=[C:16]([C:19]#[N:20])[CH:17]=[CH:18][C:13]=3[N:12]=[CH:11]2)[CH2:4]1.C1C[O:25][CH2:24]C1>>[O:25]=[C:24]1[NH:1][CH2:2][C@@:3]2([CH2:8][CH2:7][CH2:6][C@H:5]([CH2:9][N:10]3[C:14]4[CH:15]=[C:16]([C:19]#[N:20])[CH:17]=[CH:18][C:13]=4[N:12]=[CH:11]3)[CH2:4]2)[O:21]1Komponenten
3
Reaktionsbedingungen
- Temperatur
- 160 °C
Versuchsvorschrift
A suspension of 1-[(3S,5S)-1-oxaspiro[2.5]oct-5-ylmethyl]-1H-benzimidazole-6-carbonitrile (760 mg, 2.84 mmol) in MeOH (8 mL) was treated with 7M ammonia in MeOH (1.429 mL, 10.00 mmol) in a 20 mL microwave vial. The vial was sealed and heated in a microwave at 100° C. for 3 h. The reaction mixture was cooled to RT and blown down to dryness with nitrogen for 24 h to give crude 1-{[(1S,3S)-3-(aminomethyl)-3-hydroxycyclohexaneyl]methyl}-1H-benzimidazole-6-carbonitrile which was used without further purification. A solution of 1-{[(1S,3S)-3-(aminomethyl)-3-hydroxycyclohexaneyl]methyl}-1H-benzimidazole-6-carbonitrile (808 mg, 2.84 mmol) in THF (24 mL) was sealed under nitrogen in three 20 mL microwave vials and heated with microwave at 160° C. for 3 h. The combined reaction mixture was then concentrated to dryness and 50 mL of water was added. The solid was then filtered and washed with 2×10 mL of water. The solid was air-dried under house vacuum overnight. The compound was purified under normal phase flash column chromatography (ISCO CombiFlash Rf, 120 g silica column, MeOH/DCM 0-10%) to give 1-{[(5S,7S)-2-oxo-1-oxa-3-azaspiro[4.5]dec-7-yl]methyl}-1H-benzimidazole-6-carbonitrile as an off-white solid (856 mg, 97% yield). The aromatic region of the NMR spectra showed that the product contained less than 8% of the cis-diastereomer. MS (m/z) 311.1 (M+H+).