Selective [3+2] Cycloadditions of β-Amino-α,β-unsaturated Pentacarbonylcarbenechromium Complexes to Alkynes - A New Approach to Functionally Substituted Cyclopentadienes

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Abstract
(3-Amino-1-ethoxyalkenylidene)pentacarbonylchromium complexes 2 react with alkynes in pyridine or acetonitrile to give highly substituted 5-amino-3-ethoxycyclopentadienes 3 as formal [3+2]-cycloadducts selectively in high yields rather than the usually favored [2+2+1]-cycloadducts, 5-methylene-2-cyclopenten-1-ones.

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