反应详情

The title B compound, 2-(4-methoxybenzyl)-1,1-dioxo-1,2,5-thiadiazolidin-3-one (128 mg, 0.5 mmol), 4-hydroxypyridine (109 mg, 1 mmol) and triphenylphosphine (262 mg, 1 mmol) are put into a small reaction vessel under argon and dissolved in 10 mL of THF. This solution is stirred in an ice/water bath and diethyl azodicarboxylate (174 mg, 1 mmol) diluted with an equal volume of THF is added dropwise to the stirred cold solution. The reaction is allowed to stir 16 h while the ice bath slowly warms to RT. The solvent is evaporated on the rotary evaporator, then the residue is taken up in a minimal amount of CH2Cl2 and chromatographed on a 10 g RediSep silica gel column, using a gradient from 1 to 5% EtOAc in CH2Cl2 over 15 to 20 min to afford 2-(4-methoxybenzyl)-1,1-dioxo-5-pyridin-4-ylmethyl-1,2,5-thiadiazolidin-3-one: [M+1]+=348.

1. additionis added dropwise to the stirred cold solution
2. customslowly warms to RT
3. customThe solvent is evaporated on the rotary evaporator
4. customchromatographed on a 10 g RediSep silica gel column
5. customover 15 to 20 min