Abstract
Publisher Summary This chapter discusses the progress of synthetic procedures and applications of 2,1-benzothiazines and related compounds. Togo's group reported the preparation of the 2,1-benzothiazines via an ionic pathway with hypervalent iodine compounds. Using this method, it was found to be far easier to synthesize five- or seven-membered benzosultams and avoid the difficult deprotection of the N-alkyl group in the six-membered benzosultams to give the free NH group. The reaction of N-methoxy 2-(aryl)ethanesulfonamides with various hypervalent iodine reagents produced the cyclization products in various yields that were dependent on the dielectric constant of solvents. A reductive, intramolecular, free radical arylation using tributyltin hydride/AIBN was introduced by the Motherwell group. Cyclic sulfilimines are considered useful reagents in organic synthesis. The chemistry of cyclic sulfilimines has been studied extensively since the 1970s.
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