Abstract
The rhodium (II) acetate-catalysed decomposition of 3-diazobenzopyran-2,4(3H )-dione in the presence of a terminal alkyne gave rise to a mixture of isomeric 2-substituted
furo[3,2-c ]coumarin and furo[2,3-b ]coumarin, resulting from a formal [3+2] cycloaddition.
Key words
heterocyclisation - furocoumarins - diazocoumarins - diazocarbonyl compounds - rhodium
carbene
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