An unexpected ring-opening of a 2-pyrone ring at low temperatures. A mild and expeditious synthesis of novel coumarins
Tetrahedron Letters(2001)
Abstract
When the iminium salts of ortho-hydroxy arylaldehydes were condensed with a 4-hydroxy-2-pyrone at room temperature or well below, a series of unique coumarins were isolated via a translactonization at the expense of an unexpected ring-opening of the 2-pyrone nucleus.
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Key words
room temperature
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