Synthesis of Five-Membered Rings with Two Heteroatoms

Synthesis of Five-Membered Rings with Two Heteroatoms 

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J2.3 Synthesis of Five-Membered Rings with Two Heteroatoms 395... 

Synthesis of Five-membered Rings with Two or More Heteroatoms... 

Although some of the oxidative ring closures described above, e.g. reactions with lead tetraacetate (Section 4.03.4.1.2), may actually involve radical intermediates, little use has been made of this reaction type in the synthesis of five-membered rings with two or more heteroatoms. Radical intermediates involved in photochemical transformations are described in Section 4.03.9. Free radical substitutions are described in the various monograph chapters. 

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