Phosphorus pentachloride → 4-(1,3-Dioxoisoindolin-2-yl)cyclohexane-1-sulfonyl chloride

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Reaction Steps

A mixture of 4-(1,3-dioxoisoindolin-2-yl)cyclohexane-1-sulfonic acid (6.8 g, 22 mmol) and PCl5 (5 g, 24 mmol) was stirred at room temperature for 30 min. And then the mixture was heated at 100° C. and stirred for 2 h. After cooling to room temperature, the mixture was washed with EtOAc (150 mL×3). The combined extracts were concentrated in vacuo to give crude 4-(1,3-dioxoisoindolin-2-yl)cyclohexane-1-sulfonyl chloride (5 g, 68%) as a whit solid, which was used in the next step directly.

Provenance & Evidence