Iodobenzene-catalyzed cyclization of 2-aryl-N-methoxyethanesulfonamides with m-chloroperoxybenzoic acid results in the corresponding 1-methoxy-3,4-dihydro-1H-2,1-benzothiazine 2,2-dioxides in moderate to good yields. In this reaction, reactive hypervalent iodine [(hydroxy)(tosyloxy)iodo]benzene, formed in situ, reacts with the 2-aryl-N-methoxyethanesulfonamides in an electrophilic manner at the aromatic ring to give the corresponding 1-methoxy-3,4-dihydro-1H-2,1-benzothiazine 2,2-dioxides.
在
碘苯催化下,2-芳基-N-甲氧基
乙烷磺酰胺与
间氯过氧苯甲酸发生环化反应,生成相应的 1-甲氧基-3,4-二氢-1H-2,1-苯并
噻嗪 2,2-二氧杂化物,收率中等至良好。在该反应中,原位形成的活性高价
碘[(羟基)(对
甲苯磺酰氧基)
碘]苯与 2-芳基-N-甲氧基
乙烷磺酰胺在芳香环上发生亲电反应,生成相应的 1-甲氧基-3,4-二氢-1H-2,1-苯并
噻嗪 2,2-二氧化物。