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Original Articles

ENCHAINEMENTS HETEROATOMIQUES ET LEURS PRODUITS DE CYCLISATION—X1. METHYLTHIO-7 ET MESYL-7 CEPHEMES A PARTIR DE METHYLENE-2 DIHYDRO-3,6 2H-THIAZINES-1,3

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Pages 87-98 | Received 11 Jul 1988, Published online: 04 Oct 2006
 

Abstract

The 2-methylene-3,6-dihydro-2H-1,3-thiazines obtained in three steps from a 2-cyanopropanoate are converted into 6H-1,3-thiazines by introduction of a methylthio or mesyl group at the exocyclic carbon bound to the two position. These compounds lead to the synthesis of 7-methylthio and 7-mesyl cephems.

Les mtthyltne-2 dihydro-3,6 2H-thiazines-1,3 préparées en trois étapes à partir d'un cyano-2 propanoate sont converties en 6H-thiazines-1,3 par introduction d'un groupement méthylthio ou mésyle sur le carbone exocyclique en position 2. Les composés ainsi obtenus permettent de décrire la synthèse de méthylthio-7 et mésyl-7 céphèmes.

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