Reaction of alkenes and alkenols with N-iodosuccinimide (NIS) and benzenesulfinic acid in dichloromethane at room temperature affords vic-iodophenylsulfonyl adducts in good to high yields. Treatment of the iodosulfones with neutral alumina in dichloromethane at room temperature results in dehydroiodination to give the corresponding vinyl sulfones in high yield and purity by this convenient two-step procedure. Application of the iodosulfonationdehydroiodination sequence to allylic alcohols and silyl ethers gave γ-oxygenated, α,β-unsaturated phenylsulfones, while the attempted iodosulfonation of glycals, as intermediates to vinyl sulfones, resulted in addition of benzenesulfinic acid with double bond shift (Ferrier rearrangement). Key words: iodosulfonation, vinyl sulfones, benzenesulfinic acid, N-iodosuccinimide, dehydroiodination.
室温下,烯和烯醇与 N-iodosuccinimide (NIS) 和
苯亚磺酸在
二氯甲烷中发生反应,生成的邻
碘苯磺酰基加合物收率高。在室温下,用中性氧化铝在
二氯甲烷中处理
碘砜,然后进行脱氢
碘化,通过这种简便的两步法得到相应的
乙烯基砜,收率和纯度都很高。将
碘磺化脱氢
碘化顺序应用于烯丙基醇和
硅基醚,可得到γ-氧合的、α,β-不饱和的苯基砜,而尝试对作为
乙烯基砜中间体的
甘油进行
碘磺化,则会导致
苯亚磺酸的加成和双键转移(费里尔重排)。关键词:
碘磺化、
乙烯基砜、
苯亚磺酸、N-
碘代丁二
酰亚胺、脱氢
碘化。