4-Toluenesulfonyl chloride → HCID 14010511, compound

Participants

Reaction Steps

Methyl 3-O-benzyl-6-O-trityl-2-deoxy-α-D-ribo-hexopyranoside (13.3 g; 26.05 mmoles) was dissolved in dry pyridine (41 ml) and cooled in an ice bath under nitrogen. p-Toluenesulfonyl chloride (9.93 g, 52.09 mmoles) was added all at once and the reaction was stirred at room temperature under nitrogen overnight. The reaction was partitioned between ether and water. The ether layer was extracted four times with water, dried (K2CO3, anhyd), and the solvent evaporated in vacuo to leave 19.1 g of crude product which was chromatographed on silica gel (1 kg) eluting with methylene chloride until excess p-toluenesulfonyl chloride had been eluted. Elution was continued with 2% (by volume) acetone in methylene chloride. Fractions containing the product were collected and evaporated to dryness to leave 15.5 g of methyl 3-O-benzyl-4-O-tosyl-6-O-trityl-2-deoxy-α-D-ribo-hexopyranoside as a glassy gum, [α]D25 =66.24 (C, 1.0, CHCL3).

Provenance & Evidence