Oligocyclization of 2-(hydroxymethyl)pyrroles with electron-withdrawing groups at β-positions: formation and structural elucidation of porphyrinogens and hexaphyrinogens
Oligocyclization of 2-(hydroxymethyl)pyrroles with electron-withdrawing groups at β-positions: formation and structural elucidation of porphyrinogens and hexaphyrinogens
<i>meso</i>-Unsubstituted Porphyrinogens and Hexaphyrinogens: The First X-ray Characterization
作者:Hidemitsu Uno、Takashi Inoue、Yumiko Fumoto、Motoo Shiro、Noboru Ono
DOI:10.1021/ja000482e
日期:2000.7.1
Oligocyclization of 2-(hydroxymethyl)pyrroles with electron-withdrawing groups at β-positions: formation and structural elucidation of porphyrinogens and hexaphyrinogens
作者:Hidemitsu Uno、Kentarou Inoue、Takashi Inoue、Noboru Ono
DOI:10.1039/b307132d
日期:——
Acid-catalyzed oligomerization of 2-(hydroxymethyl)pyrroles bearing C6F5, 2,6-Cl2C6H3, CF3 and CO2Et groups at β-positions was examined. The reaction of ethyl pyrrole-3-carboxylates gave a mixture of oligomers and type I isomers of porphyrinogens and hexaphyrinogens were isolated when the other β-substituents were sufficiently bulky, for example, mesityl, 2,6-Cl2C6H3 and C6F5 groups. On the other hand, the pyrroles having other electron-withdrawing groups afforded porphyrinogens as the only isolable products.