Catalytic Regio- and Stereoselective Alkene Sulfenoamination for 1,4-Benzothiazine Synthesis

Nur-E Alom; Navdeep Kaur; Fan Wu; Shannon Jasmine Saluga; Wei Li

doi:10.1002/chem.201900549

Catalytic Regio- and Stereoselective Alkene Sulfenoamination for 1,4-Benzothiazine Synthesis

Chemistry. 2019 May 17;25(28):6902-6906. doi: 10.1002/chem.201900549. Epub 2019 May 2.

Authors

Nur-E Alom¹, Navdeep Kaur¹, Fan Wu¹, Shannon Jasmine Saluga¹, Wei Li¹

Affiliation

¹ Department of Chemistry and Biochemistry and School of Green Chemistry and Engineering, The University of Toledo, Toledo, OH, 43606, USA.

PMID: 30913321
DOI: 10.1002/chem.201900549

Abstract

An alkene sulfenoamination reaction with 2-aminothiophenol is developed using iodide catalysis. This reaction renders access to useful 1,4-benzothiazines with good functional group compatibility including both electron-donating and electron-withdrawing substituents. The reaction is proposed to proceed through an inversion of the polarity of the thiol functionality. Our mechanistic studies reveal that both thiiranium and thiyl radical pathways are plausible and that the disulfide reagent can also function as a viable substrate in this reaction.

Keywords: 1,4-benzothiazines; alkene sulfenoamination; heterocycles; iodide catalysis; thiiranium.