Coarctate versus Pericyclic Reactivity in Naphthalene-Fused Azo-Ene-Ynes: Synthesis of Benzocinnolines and Benzoisoindazoles
作者:Sean P. McClintock、Lev N. Zakharov、Rainer Herges、Michael M. Haley
DOI:10.1002/chem.201002936
日期:2011.6.6
The cyclization reactions of naphthalene‐fused azo–ene–yne compounds are explored both computationally and experimentally. Calculations reveal that naphtho‐fusion to an azo–ene–yne scaffold does not significantly alter the transition state energies compared to the benzene‐based systems; however, fusing the naphthalene in an angular fashion leads to lower energy intermediates due to the creation of
萘稠合的偶氮烯炔化合物的环化反应在计算和实验上都得到了探索。计算表明,与基于苯的系统相比,萘向偶氮-炔-炔骨架的融合不会显着改变过渡态能量。然而,由于形成具有更高芳香性的芳烃,以一定角度融合萘会降低能量中间体。实验上,角体系的环化不仅产生了预期的单体苯并肉桂啉和苯并异吲唑,而且还产生了几种二聚结构,包括在轻酸和/或痕量酸存在下易于异构化的二聚结构。