Synthesis of Octaglycosylated
Zinc(II) Phthalocyanines

Zafar Iqbal; Alexey Lyubimtsev; Timo Herrmann; Michael Hanack; Thomas Ziegler

doi:10.1055/s-0030-1258178

PAPER

Synthesis of Octaglycosylated Zinc(II) Phthalocyanines

Zafar Iqbal^a, Alexey Lyubimtsev^a,b, Timo Herrmann^c, Michael Hanack*^a, Thomas Ziegler*^a
^a Institut für Organische Chemie, Universität Tübingen, Auf der Morgenstelle 18, 72076 Tübingen, Germany
Fax: +49(7071)295268; e-Mail: hanack@uni-tuebingen.de ; e-Mail: thomas.ziegler@uni-tuebingen.de;
^b Ivanovo State University of Chemistry and Technology, Organic Chemistry Department, F. Engels Str. 7, 153460 Ivanovo, Russian Federation
^c Medical and Natural Sciences Research Centre, Universität Tübingen, Ob dem Himmelreich 7, 72074 Tübingen, Germany

Abstract

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Abstract

For the first time, octaglycosylated zinc(II) phthalocyanines in which the sugar part is protected by acetyl groups and the deprotected zinc(II) phthalocyanines were synthesized and characterized. The sugars glucose, galactose, lactose, cellobiose, and maltose are anomerically attached either via oxygen or sulfur to the phthalocyanine ring. The necessary starting materials for the syntheses of the phthalocyanines, the anomerically 4,5-diglycosylated phthalonitriles, were obtained by reacting the anomerically deprotected sugars containing OH and SH groups with 4,5-difluorophthalonitrile. The acetyl protected octaglycosylated phthalocyanines were obtained in yields between 55 and 78% by heating the anomerically 4,5-diglycosylated phthalonitriles in DMF with hexamethyldisilazane, p-toluenesulfonic acid, and zinc acetate. The acetyl groups in sugar moieties were removed to afford corresponding water-soluble phthalocyanines.

Key words

phthalocyanines - octaglycosylated - zinc - structural isomers

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