Three in one go: Unactivated dienes containing a cycloalkenyl moiety reacted with a range of substituted aryl halides in the presence of Pd(OAc)2/PPh3 to afford fused polycyclic heterocycles (see scheme). Three carbon–carbon bonds are formed in this domino reaction, which involves highly regioselective CC coupling and CH functionalization steps. DMF=N,N‐dimethylformamide; Bn=benzyl, Ts=p‐toluenesulfonyl
Iron-Mediated Radical Nitro-Cyclization Reaction of 1,6-Dienes
作者:Tsuyoshi Taniguchi、Hiroyuki Ishibashi
DOI:10.1021/ol902510p
日期:2010.1.1
involved radical addition of a nitro group to 1,6-dienes promoted by the thermal decomposition of iron nitrate(III) nonahydrate, cyclization, and trapping of the resulting terminal radicals by a chlorine atom in the presence of chloride salt afforded five-membered-ring compounds. The present reaction provides a practical method for the synthesis of nitro compounds due to its simple experimental procedure
Treatment of 1,6-dienes and enynes with FeCl3 or Fe(Pc) in the presence of NaBH4 and air or O-2 causes radical cyclization to give five-membered carbo or heterocyclic compounds, Into which a halogen atom or hydroxyl group was introduced.
Bothe; Rudbeck; Tanner, Journal of the Chemical Society. Perkin Transactions 1 (2001), 2001, # 24, p. 3305 - 3311
作者:Bothe、Rudbeck、Tanner、Johannsen
DOI:——
日期:——
Ni(I)-Catalyzed Reductive Cyclization of 1,6-Dienes: Mechanism-Controlled trans Selectivity
cyclization of 1,6-dienes affords 3,4-disubstituted cyclopentane and pyrrolidine derivatives with high trans diastereoselectivity. This cyclization reaction enables the efficient synthesis of trans-3,4-dimethyl gababutin, a pharmaceutical lead for treating neuropathic pain, and trans-3,4-dimethylpyrrolidine, a precursor to drug candidates and pesticides. The trans selectivity distinguishes this reaction