Biradicals from Benzoenyne−Allenes. Application in the Synthesis of 11<i>H</i>-Benzo[<i>b</i>]fluoren-11-ols, 1<i>H</i>-Cyclobut[<i>a</i>]indenes, and Related Compounds
作者:Hongbin Li、Hai-Ren Zhang、Jeffrey L. Petersen、Kung K. Wang
DOI:10.1021/jo0104577
日期:2001.10.1
New synthetic pathways to 11H-benzo[b]fluoren-11-ols, 1H-cyclobut[a]indenes, and related compounds via biradicals generated from benzoenyne-allenes were developed. Treatment of the diacetylenic propargylic alcohols 13, derived from condensation between benzophenones and the lithium acetylide of 1-(2-ethynylphenyl)-2-phenylethyne, with thionyl chloride produced the 11-chloro-11H-benzo[b]fluorene 14
Polycyclic Aromatic Compounds via Radical Cyclizations of Benzannulated Enyne-Allenes Derived from Ireland−Claisen Rearrangement
作者:Yonghong Yang、Jeffrey L. Petersen、Kung K. Wang
DOI:10.1021/jo035036z
日期:2003.10.1
after hydrolysis, the carboxylic acid 16 in 57% overall yield from 10 in a single operation. An intramolecular acylation reaction of 16 produced the ketone 17. The carboxylic acids 24-26 were likewise prepared from the diaryl ketones 18-20, respectively. However, the intramolecular [2 + 2] cycloaddition reaction of the benzannulated enyne-allene 33 having a tert-butyl group at the allenic terminus occurred