反应详情

A solution of the title B compound, 2-(4-methoxybenzyl)-1,1-dioxo-1,2,5-thiadiazolidin-3-one (1.02 g, 3.98 mmol), 3-iodo-benzyl alcohol (1.01 mL, 7.95 mmol) and triphenylphosphine (2.10 g, 8.0 mmol) in THF (50 mL) is cooled to 5° C. and treated with a solution of diethyl azodicarboxylate (1.26 mL, 8.0 mmol) in THF (10 mL). The reaction is allowed to warm to RT over 16 h. The reaction mixture is concentrated to yield a yellow oil. This is chromatographed on a 110 g silica gel RediSep column (Isco, Inc.) with a 30 mL/min gradient elution of 0:100 (EtOAc:CH2Cl2) to 5:95 over 25 min. Fractions containing product are combined and concentrated to yield an oil, which spontaneously crystalizes. Trituration with Et2O yields 5-(3-iodo-benzyl)-2-(4-methoxy-benzyl)-1,1-dioxo-1,2,5-thiadiazolidin-3-one as a white solid: mp=98-100° C.

1. concentrationThe reaction mixture is concentrated
2. customto yield a yellow oil
3. customThis is chromatographed on a 110 g silica gel RediSep column (Isco, Inc.) with a 30 mL/min gradient elution of 0:100 (EtOAc:CH2Cl2) to 5:95 over 25 min
4. additionFractions containing product
5. concentrationconcentrated
6. customto yield an oil, which
7. customspontaneously crystalizes