A one-pot synthesis of methyl 6-chlorosulfonyl-3-methyl-1,2-benzoxathiin-8-carboxylate 2,2- dioxide (9), characterized as its 6-(4-methylpiperazin-1-yl)sulfonyl derivative 10, is achieved via direct reaction of methyl 3-allylsalicylate (1) with chlorosulfonic acid at −7°C. The latter reagent converts methyl 2-methyl-2,3-dihydrobenzofuran-7-carboxylate (3) into the respective 5-chlorosulfonyl derivative 7 (identified as its 5-(4-methylpiperazin-1-yl)sulfonyl derivative 8), while contrary to literature reports, the aromatic δ -sultones 9, 10 (anticipated to be produced from 3) were not detected.
甲基6-氯磺酰基-3-甲基-1,2-苯并噻嗪-8-羧酸甲酯2,2-二氧化物(9)的一锅合成,以其6-(4-甲基哌嗪-1-基)磺酰衍生物10为特征,通过在-7°C下将甲基3-烯丙基水杨酸甲酯(1)直接与氯磺酸反应而实现。后一试剂将甲基2-甲基-2,3-二氢苯并呋喃-7-羧酸甲酯(3)转化为相应的5-氯磺酰衍生物7(鉴定为其5-(4-甲基哌嗪-1-基)磺酰衍生物8),而与文献报道相反,芳香族δ-磺酮9, 10(预计从3产生)未被检测到。