Issue 7, 2004

The synthesis of fused and spiro annulated carbohydrate structures using copper(i) catalysed intramolecular photoannulation of glucose derivatives

Abstract

Intramolecular [2 + 2] photoannulation catalysed by copper(I)triflate has been applied to a series of carbohydrate derivatives obtained from glucose. Dienes 1a and 1b lead to cyclobutanes 3a and 3b whereas the diastereoisomeric dienes 5a and 5b gave diastereoisomeric products 7a and 7b. These results demonstrate that the reaction is stereospecific. Products 3a and 7a were converted into bromoesters 4 and 9 respectively. The Vasella elimination of 8 lead to the expected bicyclic aldehyde 10 and the ring expanded hydroxy ketone 12. The stereospecific formation of enantiomerically pure spiro annulated carbohydrates 18a and 18b was demonstrated whereas in example 19 no selectivity in the formation of 20 and 21 was observed.

Graphical abstract: The synthesis of fused and spiro annulated carbohydrate structures using copper(i) catalysed intramolecular photoannulation of glucose derivatives

Supplementary files

Article information

Article type
Paper
Submitted
02 Dec 2003
Accepted
05 Feb 2004
First published
25 Feb 2004

Org. Biomol. Chem., 2004,2, 1093-1097

The synthesis of fused and spiro annulated carbohydrate structures using copper(I) catalysed intramolecular photoannulation of glucose derivatives

D. J. Holt, W. D. Barker, S. Ghosh and P. R. Jenkins, Org. Biomol. Chem., 2004, 2, 1093 DOI: 10.1039/B315623K

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