Synthesis and derivatization of 4-arylsulfonylthiophene- and furan-2-sulfonamides
作者:George D. Hartman、Wasyl Halczenko
DOI:10.1002/jhet.5570270202
日期:1990.2
Novel 4-arylsulfonylthiophene- and furan-2-sulfonamides are prepared from the 3-arylsulfonyl heterocycle via chlorosulfonation with chlorosulfonic acid/phosphorus pentachloride. Free radical bromination affords bromomethyl analogues that are precursors to amine derivatives of the parent thiophenesulfonamides. Instability of the furansulfonyl chlorides to free radical bromination necessitated a sequence
由3-芳基磺酰基杂环通过用氯磺酸/五氯化磷进行氯磺化反应,由3-芳基磺酰基杂环化合物制备新型的4-芳基磺酰基噻吩-和呋喃-2-磺酰胺。自由基溴化提供了溴甲基类似物,该溴甲基类似物是母体噻吩磺酰胺的胺衍生物的前体。呋喃磺酰氯对自由基溴化的不稳定性使得需要在氯磺化之前使用溴甲基生成的序列。甲氧基取代的磺酰胺的脱甲基作用得到的酚用曼尼希试剂进行了有效的单和双烷基化反应。