反应详情

The title B compound, 2-(2,4-dimethoxybenzyl)-1,1-dioxo-1,2,5-thiadiazolidin-3-one (98 mg, 0.34 mmol) and (4-hydroxymethylphenyl)carbamic acid t-butyl ester (153 mg, 0.68 mmol) and triphenylphosphine (180 mg, 0.68 mmol) are dissolved in THF (10 mL) with stirring under argon atmosphere. The reaction is cooled in an ice/water bath and diethyl azodicarboxylate (0.107 mL, 0.68 mmol) dissolved in THF (0.107 mL) is added dropwise. After 16 h, the solvent is evaporated and the residue is taken up in a minimal amount of CH2Cl2 and chromatographed on silica gel with a gradient from 1 to 5% EtOAc in CH2Cl2 over 15 min to give {4-[5-(2,4-dimethoxybenzyl)-1,1,4-trioxo-1,2,5-thiadiazolidin-2-ylmethyl]-phenyl}-carbamic acid t-butyl ester as an oil: [M+NH4]+=509.

1. temperatureThe reaction is cooled in an ice/water bath
2. additionis added dropwise
3. customthe solvent is evaporated
4. customchromatographed on silica gel with a gradient from 1 to 5% EtOAc in CH2Cl2 over 15 min