ISOPROPYLSULFONYL CHLORIDE

• 1-Isopropylsulfonyl-2-amine benzimidazole by reacting with 2-aminobenzimidazole via N-sulfonylation reaction in the presence of a base.
• Bis(isopropylsulfonyl)disulfide, a sulfurizing agent, used to synthesize phosphorothioate oligonucleotide analogs.

75-33-2

10147-37-2

The general procedure for the synthesis of isopropylsulfonyl chloride from isopropyl mercaptan is as follows: a solution of isopropyl mercaptan (1 eq.) and isopropanol (2 eq.) was stirred in dichloromethane (0.15 M). Subsequently, N-bromosuccinimide (4 eq.) or N-chlorosuccinimide (3.5 eq.) was added in batches at room temperature (when N-bromosuccinimide was used) or at 0 °C (when N-chlorosuccinimide was used). The reaction mixture was stirred at room temperature until the starting material was undetectable by thin layer chromatography (TLC) (about 1 hour). After completion of the reaction, the reaction mixture was diluted with cold saturated sodium bicarbonate solution and extracted with ethyl acetate (four times). The organic extracts were combined, dried with sodium sulfate and subsequently concentrated under vacuum to give the crude product. Finally, pure isopropylsulfonyl chloride was purified by silica gel column chromatography or radial chromatography using a hexane/ethyl acetate/acetone solvent mixture as eluent to give pure isopropylsulfonyl chloride.