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Synthesis 2004(7): 1115-1118
DOI: 10.1055/s-2004-815971
DOI: 10.1055/s-2004-815971
PSP
© Georg Thieme Verlag Stuttgart · New York
Reductive Ring Opening of Oxygen-Containing Benzo-Fused Heterocycles by an Arene-Catalysed Lithiation
Further Information
Received
29 December 2003
Publication Date:
12 February 2004 (online)
Publication History
Publication Date:
12 February 2004 (online)
Abstract
The reductive ring opening of phthalan and isochroman in a 8 mmol scale process, using a small excess of lithium (1.35 equiv) and a substoichiometric amount of DTBB (3 mol%), leads to functionalised organolithium compounds, which after reaction with (-)-menthone as electrophile followed by hydrolysis with water, gives the corresponding diols in good yields with high stereoselectivity. Dehydration of these diols leads to the corresponding oxygen-containing heterocycles, which are homologous of the starting heterocycles.
Key words
functionalised organolithium compounds - stereoselective addition - reductive opening - lithiation
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