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Enantioselectivity of Transition Metal Catalyzed 1,3-Cycloadditions of 2-Diazocyclohexane-1,3-diones.

✍ Scribed by Paul Mueller; Yves F. Allenbach; Gerald Bernardinelli

Publisher
John Wiley and Sons
Year
2004
Weight
154 KB
Volume
35
Category
Article
ISSN
0931-7597

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## Abstract The formal 1,3‐cycloaddition of 2‐diazocyclohexane‐1,3‐diones **1a**–1**d** to acyclic and cyclic enol ethers in the presence of Rh^II^‐catalysts to afford dihydrofurans has been investigated. Reaction with a __cis/trans__ mixture of 1‐ethoxyprop‐1‐ene (**13a**) yielded the dihydrofuran

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## Abstract The 1,3‐dipolar cycloaddition reactions of 2‐diazocyclohexane‐1,3‐dione (**7a**; __Table 1__) and of alkyl diazopyruvates (**11a**–**e**; __Table 3__) to 2,3‐dihydrofuran and other enol ethers have been investigated in the presence of chiral transition metal catalysts. With Rh^II^ catal