Triphenylphosphine → HCID 67139934, compound

Participants

Reaction Conditions

Reaction Steps

To a solution of the title B compound in Example 9, 2-(2,4-dimethoxybenzyl)-1,1-dioxo-1,2,5-thiadiazolidin-3-one (2.0 g, 7.0 mmol) and 4-hydroxymethyl-benzoic acid benzyl ester (2.54 g, 10.5 mmol) in THF (50 mL) is added triphenylphosphine (3.67 g, 14 mmol) and the mixture is stirred until dissolved. The reaction is cooled to 0° C. and diethyl azodicarboxylate (2.20 mL, 14 mmol) dissolved in THF (20 mL) is added dropwise. The reaction is stirred for 16 h, while allowing to warm to RT, then concentrated. The residue is taken up in CH2Cl2, and chromatographed in two portions on a 110 g silica gel RediSep column (Isco, Inc.) with a 30 mL/min gradient elution of 0:100 (EtOAc:hexane) to 5:95 over 10 min. Fractions containing product are combined and concentrated to yield 4-[5-(2,4-dimethoxy-benzyl)-1,1,4-trioxo-1,2,5-thiadiazolidin-2-ylmethyl]-benzoic acid benzyl ester as a white solid.

Provenance & Evidence