Efficient synthesis of tricyclic benzobisoxazines by silica gel catalysis

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34 Scopus citations

Abstract

A new method for the synthesis of tricyclic benzobisoxazines, based upon silica gel-catalyzed formation of two 3,1-oxazine rings, is reported. The reversibility of the condensation reaction, forming an oxazine ring, allows for implementation of silica gel catalyzed ketone exchange in benzobisoxazine, thus enabling access to nonsymmetric derivatives of benzobisoxazines.

Original languageEnglish (US)
Pages (from-to)1867-1869
Number of pages3
JournalJournal of Organic Chemistry
Volume72
Issue number5
DOIs
StatePublished - Mar 2 2007

ASJC Scopus subject areas

  • Organic Chemistry

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