Boron trifluoride etherate → HCID 22856009, compound

Participants

Reaction Steps

To a stirred solution of 2,4-di-O-benzyl-3-O-methyl-a,b-D-xylopyranosyl acetate (20 g, 0.052 mole) and Me3SiCN (20 ml, 0.16 mole) in anhydrous nitromethane (300 ml) was added boron trifluoride etherate (1.0 g, 0.007 mole) at room temperature. After the mixture was stirred at room temperature for 30 min, the mixture was evaporated to dryness under reduced pressure. The residue was chromatographed on silica gel using CH2C12 /AcOEt (99:1) as an eluent to give 2,4-di-O-benzyl-3-O-methyl-a,b-D-xylopyranosyl cyanide as colorless oil (13.0 g, 71% yield); EI-MS: m/z 353 (M+), 262 (M+ -Bn); 1 H-NMR of b-cyano-isomer (CDCl3)d; 3.15 (1H,dd,J=10, 11 Hz), 3.23 (1H,t,J=10 Hz), 3.49 (1H,m), 3.59 (1H,t,J=10 Hz), 3.66 (3H,s), 3.96 (1H,dd,J=5 & 11 Hz), 3.97 (1H,d,J=10 Hz), 4.61 (1H,d,J=12 Hz), 4.73 (1H,d,J=12 Hz), 4.84 (1H,d,J=11 Hz), 4.88 (1H,d,J=11 Hz), 7.29-7.42 (10H,m).

Provenance & Evidence