p-Toluenesulfonic acid → HCID 86593025, compound

Participants

Reaction Steps

To a solution of (3S,3aS,6aR)-hexahydrofuro[2,3-b]furan-3-yl (1S,2R)-1-[4-(benzyloxy)benzyl]-2-hydroxy-3-{isobutyl[(4-nitrophenyl)sulfonyl]amino}propylcarbamate (1.00 g, 1.5 mmol) in 20 mL of dichloromethane was added 2,2-dimethoxypropane (1.5 g, 14.6 mmol) and p-toluenesulfonic acid (0.09 g, 0.5 mmol). The solution was refluxed for 12 hours, and the solvent was removed under reduced pressure. The residue was purified on silica gel using ethyl acetate-hexanes (3.5:6.5) as eluent to provide 0.70 g (70%) of the title compound. 1H-NMR (CDCl3): δ 0.85 (3H,d), 0.90 (3H,d), 1.35,1.44 (3H,s)*,1.55,1.61 (3H,s)*, 1.84-2.00 (3H,m,b), 2.61-2.91 (4H,m), 2.91-3.08 (3H,m), 3.17,3.33 (1H,d)*, 3.56 (1H,t), 3.80-3.86 (2H,m), 3.91-3.98(1H,m), 4.23-4.27 (2H, m), 5.02-5.16 (2H,s), 5.67 (1H,d), 6.91 (2H,d), 7.03 (1H,d), 7.14 (1H,d), 7.31 (1H,d), 7.38 (2H,m), 7.45 (2H,d), 7.67 (2H,d), 8.25 (2H,d).

Provenance & Evidence