HCID 86755670, compound → HCID 57090370, compound

Temperature

23 °C

A solution of (1S,2R,3R,5R,6S)-3-allyloxy-2-azido-bicyclo [3.1.0]hexane-2,6-dicarboxylic acid 2-benzyl ester 6-ethyl ester (XXIII-2) (28 mg, 0.073 mmol) in HOAc (0.75 mL) and H2O (0.25 mL) was hydrogenated in the presence of Pd/C (3 mg, 10% Pd/C) at 23° C. for 18 h. The catalyst was removed by filtration, the filter cake washed with 50% aqueous ethanol. After removal of the solvent in vacuum, the beige residue was refluxed in 10% HCl (1.25 mL) for 4 h. The solution was cooled to 23° C. and evaporated to dryness. The remaining pale yellow solid was dissolved in EtOH (1 mL) and propylene oxide (0.5 mL) and refluxed for 10 min, whereupon the amino acid precipiated. After cooling to 23° C., the product was filtered off, washed with ether and dried to give (1S,2R,3R,5R,6S)-2-amino-3-propoxy-bicyclo [3.1.0]hexane-2,6-dicarboxylic acid (I-8) (13 mg, 72%) as a white solid. 1H-NMR (250 MHz, D2O) □0.81 (1H, t, J=7.5 Hz), 1.48 (2H, m), 1.84 (1H, m), 2.16 (3H, m), 2.26 (1H, dd,J=12,7 Hz), 3.43 (2H, m), 3.73 (1H,bt,J=8Hz); MS[ISN] 242 [(M-H)- ]; mp >2500 C; □D20 3.72° (c=0.19, H2O).

1. customThe catalyst was removed by filtration
2. washthe filter cake washed with 50% aqueous ethanol
3. customAfter removal of the solvent in vacuum
4. temperaturethe beige residue was refluxed in 10% HCl (1.25 mL) for 4 h
5. customevaporated to dryness
6. dissolutionThe remaining pale yellow solid was dissolved in EtOH (1 mL)
7. temperaturepropylene oxide (0.5 mL) and refluxed for 10 min, whereupon the amino acid
8. temperatureAfter cooling to 23° C.
9. filtrationthe product was filtered off
10. washwashed with ether
11. customdried

ORD record

ord-38c5022b5cb34267bdb4b390f17bfee6

Source dataset

uspto-grants-2000_08

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US06107342