The introduction of nitrile-groups into heterocycles and conversion of carboxylic groups into their corresponding nitriles with chlorosulfonylisocyanate and triethylamine
作者:Helmut Vorbrüggen、Konrad Krolikiewicz
DOI:10.1016/s0040-4020(01)89685-x
日期:——
Addition of chlorosulfonylisocyanate (CSI) to heterocycles such as thiophene (4) or indole (15) and unsaturated systems such as dihydropyran (7) gives N-chlorosulfonylamides RCONHSO2Cl, which can be converted by equivalent amounts of triethylamine to their corresponding nitriles. Since carboxylic acids react with CSI to N-chlorosulfonylamides, subsequent treatment with triethylamine affords the corresponding
将氯磺酰基异氰酸酯(CSI)添加到杂环(例如噻吩(4)或吲哚(15))和不饱和系统(例如二氢吡喃(7))中,可得到N-氯磺酰胺RCONHSO 2 Cl,可以将其等量转化为三乙胺转化为其相应的腈。由于羧酸与CSI反应生成N-氯磺酰胺,因此用三乙胺进行后续处理可得到相应的腈,但没有其他作者所要求的异氰酸酯。讨论了中间体N-氯磺酰胺转化为相应腈的机理。