Synthesis and Properties of 4<i>H</i>-Benzo[<i>hi</i>]pyrrolo[2,1,5-<i>cd</i>]indolizin-4-ones
作者:Michihiko Noguchi、Takashi Yamamoto、Shoji Kajigaeshi、Keiji Saito、Tsuyoshi Arai
DOI:10.1246/bcsj.61.423
日期:1988.2
3-Phenyl-4H-benzo[hi]pyrrolo[2,1,5-cd]indolizin-4-one (5) was prepared by saponification accompanied by the decarboxylation of the corresponding 1,2-bis(methoxycarbonyl) derivative, which was obtained by the DDQ oxidation of 5,6-dihydro one. Investigations concerning its spectral data and MO calculations revealed interesting electronic features for 5, e.g., i) a highly polarized structure in the ground state, ii) the exsistence of a peripheral [12]annulene system in acidic media, and iii) a significant stabilization of the excited state by protonation.
3-苯基-4H-苯并[hi]吡咯并[2,1,5-cd]吲嗪-4-酮(5)是通过皂化反应和相应的1,2-双(甲氧羰基)衍生物的脱羧反应制备的,该衍生物是通过5,6-二氢的DDQ氧化得到的。对其光谱数据和MO计算的研究揭示了5的有趣的电子特性,例如:i)在基态下具有高度极化的结构;ii)在酸性介质中存在外围[12]环烯系统;iii)通过质子化显著稳定激发态。