From α, β??Unsaturated Fischer Carbene Complexes to Highly Substituted 3??Ethoxycyclopentadienes, Masked Cyclopentenones

…, T Labahn, M Noetzel, A de Meijere

文献索引：Wu, Yao-Ting; Flynn, Bernard; Schirmer, Heiko; Funke, Frank; Mueller, Stefan; Labahn, Thomas; Noetzel, Markus; De Meijere, Armin European Journal of Organic Chemistry, 2004 , # 4 p. 724 - 748

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摘要

Abstract The β-amino-substituted α, β-unsaturated Fischer carbene complexes 3 are readily available by a four step one-pot procedure from terminal alkynes, chromium hexacarbonyl and secondary amines (24 examples with yields of 68− 99% and 7 examples with yields of 26− 63%). The formal [3+ 2] cycloadditions of complexes 3 with different alkynes including diynes and enynes performed in donor solvents such as pyridine or acetonitrile afforded ...