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Title: The synthesis of fused and spiro annulated carbohydrate structures using copper(I) catalysed intramolecular photoannulation of glucose derivatives.
Authors: Holt, DJ
Barker, WD
Ghosh, S
Jenkins, PR
First Published: 7-Apr-2004
Citation: ORG BIOMOL CHEM, 2004, 2 (7), pp. 1093-1097
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.
DOI Link: 10.1039/b315623k
ISSN: 1477-0520
Type: Journal Article
Appears in Collections:Published Articles, Dept. of Chemistry

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