FITJER L.; MAJEWSKI M.; KANSCHIK A.; EGERT E.; SHELDRICK G. M., TETRAHEDRON LETT., 27,(1986) N 31, 3603-3606
作者:FITJER L.、 MAJEWSKI M.、 KANSCHIK A.、 EGERT E.、 SHELDRICK G. M.
DOI:——
日期:——
Synthesis and rearrangement of dispiro[2.0.3.4]-, dispiro-[3.0.3.3]- and dispiro[2.1.3.3]undecanes - preferred C4-C5 over C3-C4 and C4-C3 over C5-C6 rearrangements
10–12 have been synthesized and rearranged by treatment with acids. With 10, an initial C3-C4 ringenlargement leads to [3.3.3]propellane 21, with 11, an initial C4-C3 ring contraction leads to pentalene 37, and with 12, an initial C4-C5 ringenlargement leads to 42, 43, 44 or 45, depending on the reagent used. The structure of 43 has been determined by crystal structure analysis of the 3,5-dinitrobenzoate
Synthesis and rearrangement of functionalized dispiro[2.1.3.3]Undecanes - preferred C4C5 over C3C4 ring enlargements
作者:Lutz Fitjer、Marita Majewski、Andreas Kanschik、Ernst Egert、George M Sheldrick
DOI:10.1016/s0040-4039(00)84860-1
日期:1986.1
The functionalized dispiro[2.1.3.3]undecanes and undergo cascade rearrangements to yield the bi- and tricyclic systems , , and , respectively. The rearrangements proceed via an initial enlargement of the four-membered ring.