Synthesis of -β-Amidevinyl Benziodoxolones from the Ethynyl Benziodoxolone-Chloroform Complex and Sulfonamides.

The synthesis of -β-amidevinyl benziodoxolones from the ethynyl benziodoxolone-chloroform complex and sulfonamides is reported. Evidence indicates that highly reactive unsubstituted ethynyl benziodoxolone undergoes Michael addition of sulfonamides, including sterically demanding acyclic amino acid derivatives. The synthesis of selectively deuterated -β-amidevinyl benziodoxolones and investigation of ethynyl-λ-iodane reactivity are also described.