Intramolecular 1,2-Aroyl Migration in Spiro Donor–Acceptor Cyclopropanes: Formation of 1,4-Naphthoquinones and 1-Naphthols as Ring-Expansion Products
作者:Franklin Leslin Daniel、Kannupal Srinivasan
DOI:10.1021/acs.joc.3c02671
日期:2024.4.19
known rearrangement reactions of donor–acceptor cyclopropanes (DACs) involve the migration of cationic carbon atom to anionic carbon or heteroatoms in 1,3- or 1,4-positions. In the present work, we observed that spiro DACs based on 1,3-indanedione or 1-indanone moiety undergo intramolecular 1,2-aroyl migration when treated with titanium(IV) chloride to afford 1,4-naphthoquinones and α-naphthols readily
大多数已知的供体-受体环丙烷(DAC)重排反应涉及阳离子碳原子向阴离子碳或1,3-或1,4-位杂原子的迁移。在目前的工作中,我们观察到基于 1,3-茚满二酮或 1-茚满酮部分的螺环 DAC 在用氯化钛(IV)处理时会发生分子内 1,2-芳酰基迁移,从而很容易地生成 1,4-萘醌和 α-萘酚。该反应通过形成推定的 1,3-偶极中间体,然后芳酰基裂解并迁移至相邻的碳以提供环扩展产物而发生。