One-Step Construction of Five Successive Rings by Rhodium-Catalyzed Intermolecular Double [2+2+2] Cycloaddition: Enantioenriched [9]Helicene-Like Molecules
Enantioenriched fluorenone‐containing [9]helicene‐likemolecules have been successfully synthesized through the formation of five successive rings by rhodium‐catalyzed intermolecular double [2+2+2] cycloadditions of 2‐naphthol‐linked tetraynes with dialkynylketones (see scheme; cod=cycloocta‐1,5‐diene). Their unique crystal structures and photophysical properties have also been determined.
Enantioenriched benzopyrano- and naphthopyrano-fused helical phosphafluorenes have been synthesized by the rhodium-catalyzed enantioselective double [2 + 2 + 2] cycloaddition of dialkynyl phosphorus compounds with phenol- or naphthol-linked tetraynes. Photophysical properties of these phosphafluorenes are also disclosed.
Cyclic Acetylenes. I. Cyclic Derivatives of<i>o</i>,<i>o</i>′-Dihydroxydiphenyl-diacetylene. An Example of a Strained Cyclic Diacetylene
作者:Fumio Toda、Masazumi Nakagawa
DOI:10.1246/bcsj.33.223
日期:1960.2
The Synthesis of<i>o</i>,<i>o</i>′-Dihydroxydiphenyldiacetylene