2016
DOI: 10.1002/slct.201601601
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Cu(OAc)2/I2‐Mediated Direct Sulfonylation of Benzo[d]imidazoles with Disulfides

Abstract: A novel method for direct sulfonylation of disulfides with benzo[d]imidazoles mediated by Cu(OAc)2 and iodine has been established. This protocol allows for the preparation of diverse sulfonamides with broad functionalities in moderate to good yields. The control experiments have shown that the oxygen atoms in sulfonamides come from water.

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Cited by 5 publications
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“…Sulfonylation of benzimidazoles 96 with aryl and alkyl disulfides 95 was conducted in the presence of the Cu(OAc) 2 /I 2 system (Scheme ) . Control experiments gave evidence for two possible pathways in this process: the formation of a sulfenyl iodide A from the disulfide 95 and iodine, subsequent sulfenylation of the benzimidazole 96 , and further oxidation through the action of Cu(OAc) 2 /I 2 (path 1), or the formation of a thiosulfonate of type B from the disulfide 95 in the presence of Cu(OAc) 2 , I 2 , and H 2 O, followed by sulfonylation of the benzimidazole 96 , accompanied by aryl thiol elimination (path 2).…”
Section: Synthesis Of Sulfonamidesmentioning
confidence: 99%
“…Sulfonylation of benzimidazoles 96 with aryl and alkyl disulfides 95 was conducted in the presence of the Cu(OAc) 2 /I 2 system (Scheme ) . Control experiments gave evidence for two possible pathways in this process: the formation of a sulfenyl iodide A from the disulfide 95 and iodine, subsequent sulfenylation of the benzimidazole 96 , and further oxidation through the action of Cu(OAc) 2 /I 2 (path 1), or the formation of a thiosulfonate of type B from the disulfide 95 in the presence of Cu(OAc) 2 , I 2 , and H 2 O, followed by sulfonylation of the benzimidazole 96 , accompanied by aryl thiol elimination (path 2).…”
Section: Synthesis Of Sulfonamidesmentioning
confidence: 99%