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[Unexpected formation of spiro(benzofuran-2,2'-(1,4)benzothiazines) from aurones]
K Görlitzer1, M Wichers, P G Jones
1Institut für Pharmazeutische Chemie, Technischen Universität Braunschweig, Germany.
Die Pharmazie
|May 8, 2001
Abstract:
The reaction between (Z)-2-benzylidene-3-coumaranones (aurones) 4B, 2-aminothiophenol and sodium ethanolate does not give the expected benzofuro[2,3-c][1,5]benzothiazepines 7, but yields the spiro compounds 8. Their structures are confirmed by an X-ray analysis.