作者:Lionel R. Milgrom、Philip J.F. Dempsey、Gokhan Yahioglu
DOI:10.1016/0040-4020(96)00520-0
日期:1996.7
It is shown that examples of the title porphyrins can be prepared from suitably N-protected imidazole-2-carboxaldehydes and pyrrole in refluxing propionic acid: subsequent deprotection, affords a synthetic route to 5,10,15,20-tetrakis(substituted-imidazol-2-yl)porphyrins (TIPs).
Substituted isocytosines having histamine H.sub.2 -antagonist activity
申请人:Smith Kline & French Laboratories Limited
公开号:US04154834A1
公开(公告)日:1979-05-15
The compounds are substituted isocytosines which are histamine H.sub.2 -antagonists. Two specific compounds of the present inventon are 2-[2-(5-methyl-4-imidazolylmethylthio)ethylamino]-5-(3-pyridylmethyl)-4-py rimidone and 2-[2-(3-bromo-2-pyridylmethylthio)ethylamino]-5-(4-pyridylmethyl)-4-pyrimi done.
Several new porphyrins have been prepared in improved yields using an established method which was adapted to formylpyrazoles bearing on the pyrazole N1-nitrogen protective groups. The deprotection of N-para-methoxybenzyl and SEM protected meso-pyrazolylporphyrins afforded the first known pyrazolylporphyrins with pyrazole free NH groups. The crystal and molecular structure of meso-tetrakis-1-(benz
Antiaromatic Hexaphyrins and Octaphyrins Stabilized by the Hydrogen-Bonding Interactions of<i>meso</i>-Imidazolyl Groups
作者:Hirotaka Mori、Young Mo Sung、Byung Sun Lee、Dongho Kim、Atsuhiro Osuka
DOI:10.1002/anie.201207212
日期:2012.12.7
Stable antiaromatic expanded porphyrins were designed by the judicious implementation of meso‐imidazolyl groups, which cause stabilization through the creation of a hydrogen‐bonding network (see structures) that overcomes antiaromatic electronic destabilization. Both the [28]hexaphyrin 1 and the [36]octaphyrin 2, which contain imidazolyl groups at two opposite meso positions, are shown to be stable