Tetrahedron

Transformations of pyridiniums derived from amino-alcohols and from diamines: Novel ring closures

AR Katritzky, RT Langthorne, RC Patel, G Lhommet

Index: Katritzky, Alan R.; Langthorne, Roland T.; Patel, Ranjan C.; Lhommet, Gerard Tetrahedron, 1981 , vol. 37, p. 2383 - 2390

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Citation Number: 18

Abstract

Pyridiniums derived from amino alcohols cyclise to ethers or rearrange to aldehydes on heating. Monopyridiniums from diamines can be acylated or converted into ureas or thioureas: these products cyclise on heating in solution to give dihydro-thiazoles,-4H- thiazines,-oxazoles,-4H-oxazines, or tetrahydro-3H-thiazepines.