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ChemInform Abstract: Reactivity of 3-Benzylidene- and 3-Ethylidene-2,3-dihydro-2-methyl-1,2- benzothiazin-4-one 1,1-Dioxide Towards Alkylidenephosphoranes.

✍ Scribed by P. DALLA CROCE; C. LA ROSA

Publisher: John Wiley and Sons
Year: 2010
Weight: 31 KB
Volume: 28
Category: Article
ISSN: 0931-7597
DOI: 10.1002/chin.199717158

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✦ Synopsis

Reactivity of 3-Benzylidene-and 3-Ethylidene-2,3-dihydro-2-methyl-1,2-benzothiazin-4-one 1,1-Dioxide Towards Alkylidenephosphoranes.

-The reaction of title compounds (I) and (II) leads to new heteropolycyclic systems (III) via a Michael addition followed by a prototropy and an intramolecular Wittig condensation. The oxidation of products (III) to give (IV) represents a new and efficient approach to this class of compounds. The reaction with TosOH provides sulfonamides (V). -(DALLA CROCE,

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