有机化学 ›› 2004, Vol. 24 ›› Issue (10): 1168-1190. 上一篇    下一篇

综述与进展

联烯的自由基反应

潘峰a, 傅春玲a, 麻生明*,a,b   

  1. a浙江大学化学系 杭州 310027;
    b中国科学院上海有机化学研究所金属有机国家重点实验室 上海 200032
  • 收稿日期:2003-12-23 修回日期:2004-03-16 接受日期:2004-03-16 发布日期:2022-09-20

Radical Reactions of Allenes

PAN Fenga, FU Chun-Linga, MA Sheng-Ming*,a,b   

  1. aDepartment of Chemistry, Zhejiang University, Hangzhou 310027;
    bState Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academemy of Sciences, Shanghai 200032
  • Received:2003-12-23 Revised:2004-03-16 Accepted:2004-03-16 Published:2022-09-20
  • Contact: * E-mail: masm@mail.sioc.ac.cn

联烯是含有1,2-丙二烯官能团的重要化合物,具有很高的反应活性.概述了联烯及其衍生物的自由基反应,包括分子间自由基链加成和分子间—分子内自由基串联加成反应,及其在天然产物中的应用.联烯进行分子间自由基链加成反应时,自由基对联烯的加成既可发生在中间碳原子上,也可发生在末端碳原子上,主要取于所形成中间体的稳定性,空间效应、电负性和溶剂等因素也有影响.一般以碳为中心的自由基(如CH3·, CCl3· 等)易进攻末端碳原子,而以杂原子为中心的自由基(如Br·, RS·, ArSO2·等)易进攻联烯的中心碳原子.联烯及其衍生物也易与烯烃、联烯、烯炔和乙烯酮进行[2+2]环加成反应,还可以与卡宾环丙烷化,这些反应都是通过自由基机理进行的.

关键词: 联烯, 自由基, 加成反应, 环加成, 合成应用

Allenes, which contain the functional group of 1,2-propadiene, are highly reactive. In this paper, we review some free-radical reactions of allenes. The application in natural product synthesis is also described. Substituted allenes undergo rather facile radical chain addition reactions. Attack by a radical speciescan occur at either the central or the terminal C atom. In the case of addition, the preferred route is generally that forming the possibly more stable free-radical intermediates. The steric effect, electronegativity and solvent effect shoulde also be considered. In general, carbon-centered free radicalssuch as CH3· and CCl3· add mostly to the terminal carbon atom while heteroatom-based free radicals such as Br·, RS·, ArSO2· and R3Sn· add preferentially to the central carbon atom. Substituted allenes can undergo a varietyof [2+2] cycloaddition reactions with alkenes, allenes, enynes and ketenes and also undergo a cyclopropanation with carbenes via a biradical mechanism.

Key words: allene, radical, addition reaction, cycloaddition, synthetic application