Four bonds at one stroke and products with intensive fluorescence result from a domino sequence consisting of insertion, coupling, isomerization, and Diels–Alder steps (see scheme, Ts=tosyl). Alkynoyl ortho-iodophenyl esters or N-(iodophenyl)alkynanilides 1 react with propargyl allyl ethers 2 to furnish spirocycles 3.
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D'Souza et al. (2004) studied this question.
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