Free Radical Ring Expansion of Fused-Methylenecyclobutanes
Fused methylenecyclobutanes comprise a new free radical ring expansion system leading to cis-fused methylenecycloheptanes.
Zhang, Wei,Dowd, Paul
p. 8539 - 8542
(2007/10/02)
Free-Radical Ring Expansion of Fused Cyclobutanones: Stereospecific Construction of 5,7-, 6,7-, 7,7-, 8,7-, and 5,8-Cis-Fused Bicyclic Systems
A new method of appending seven- and eight-membered rings to cycloalkenes is described.Treatment of selected alkene precursors with an ω-bromoalkyl ketene or a keteniminium salt leads to haloalkyl cyclobutanone formation.Tri-n-butyltin hydride promoted ring expansion then yields the annulated product.Since the initial cyclobutanone is cis fused, the final product is also produced stereospecifically with a cis ring fusion.
Dowd, Paul,Zhang, Wei
p. 7163 - 7171
(2007/10/02)
Free Radical Ring Expansion of Fused Cyclobutanones: A New Ring Expansion Annulation Stratagem
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Dowd, Paul,Zhang, Wei
p. 9875 - 9876
(2007/10/02)
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