Intramolecular Wittig reaction of α,α′-dioxocycloalkylidenetributylphosphoranes: formation and trapping of cycloalkyn-2-ones with five- and six-membered rings
Reaction of the title phosphoranes with homophthalic anhydride or 1,3-diphenylisobenzofuran in the presence of Me3SiCl gave the corresponding Diels–Alder adducts, indicating the transient intermediacy of cycloalkyn-2-ones with five- and six-memberedrings.
An Efficient Synthesis of <i>p</i><i>eri</i>-Hydroxy Aromatic Compounds via a Strong-Base-Induced [4+2] Cycloaddition of Homophthalic Anhydrides with Enolizable Enones
作者:Kiyosei Iio、Namakkal G. Ramesh、Akiko Okajima、Kazuhiro Higuchi、Hiromichi Fujioka、Shuji Akai、Yasuyuki Kita
DOI:10.1021/jo990649q
日期:2000.1.1
An efficient synthesis of peri-hydroxy aromatic compounds has been accomplished via a strong-base-induced [4+2] cycloaddition of homophthalic anhydrides with alpha-sulfinyl-substituted derivatives of enolizable enones. The unsubstituted enones did not undergo an efficient [4+2] cycloaddition reaction with homophthalic anhydrides, presumably due to their enolization under the basic reaction conditions
A strong-base induced [4+2] cycloaddition of homophthalic anhydrides with enolizable enones: a direct and efficient synthesis of peri-hydroxy aromatic compounds
作者:Namakkal G. Ramesh、Kiyosei Iio、Akiko Okajima、Shuji Akai、Yasuyuki Kita
DOI:10.1039/a807095d
日期:——
A direct and efficient synthesis of peri-hydroxy aromatic compounds via a strong-base induced [4+2] cycloaddition of homophthalic anhydrides with α-phenylsulfinyl enolizable enones has been accomplished.
Thiophthalides, a novel class of arene-annulating agents: synthesis of polynuclear hydroaromatic compounds
作者:Dipakranjan Mal、Ranjan Pal、Kadiyala V. S. N. Murty
DOI:10.1039/c39920000821
日期:——
Anionic cyclocondensation reaction of thiophthalides 1 with cyclohex-2-enones 2 followed by aromatization gives oxygenated hydroanthracenones 4 in good yields.
硫代苯并呋喃1与环己-2-烯酮2进行阴离子环缩合反应,然后芳构化,以良好的收率得到氧化氢蒽酮4。
Zahn; Koch, Chemische Berichte, 1938, vol. 71, p. 172,178