primary and secondary radicals are rapidly reduced in THF/HMPA to form primary- and secondary-alkylsamarium reagents. The primary- and secondary-radicals can be formed either by direct SmIsup 2} reductions of primary- and secondary-halides or by a previous rapid radical cyclization. The samarium reagents have moderate stability in solution, and they react with a variety of typical electrophiles, including
这项工作表明,伯自由基和仲自由基在 THF/HMPA 中迅速还原,形成伯和仲烷基
钐试剂。初级和次级自由基可以通过初级和次级卤化物的直接 SmIsup 2} 还原或通过先前的快速自由基环化形成。
钐试剂在溶液中具有中等稳定性,可与多种典型的亲电试剂反应,包括
醛类和
酮类。该工作进一步表明有机
钐中间体可以参与在 THF/HMPA 中进行的醛和
酮的传统
钐 Barbier 反应。引入了一种称为 open_quotes}samium Grignardclose_quotes} 方法的新程序,并建议该新程序将比
钐 Barbier 反应具有更大的范围和普遍性。37 个参考文献,4 个标签。