General Route to Purin-2-ylmagnesium Halides by Metal–Halogen Exchange in Dichloromethane
作者:Silvia Gazzola、Malcolm R. Gordon、Stephen D. Lindell
DOI:10.1055/s-0039-1690818
日期:2020.3
solution of a 9-alkyl- or 9-aryl-2-iodopurine in dichloromethane with an ethereal solution of ethylmagnesium bromide at –5 °C generates the corresponding purin-2-ylmagnesium bromide, which reacts with aldehydes to give the corresponding 2-(hydroxyalkyl)purines in yields of 53–84%. The purin-2-yl Grignard reagents show good functional-group tolerance to ester and nitro groups, and the method permits the
在 –5 °C 下用乙基溴化镁的醚溶液处理 9-烷基-或 9-芳基-2-碘嘌呤的二氯甲烷溶液,生成相应的嘌呤-2-基溴化镁,与醛反应生成相应的2-(羟烷基)嘌呤的产率为 53-84%。purin-2-yl Grignard 试剂显示出对酯和硝基的良好官能团耐受性,该方法首次允许合成以前未知的 6-未取代的 2-magnesiopurines。在作为溶剂的 THF 中执行相同的程序导致广泛的分解或快速异构化,得到 purin-8-ylmagnesium 卤化物。