Graziano Baccolini, Carla Boga, Umberto Negri
PCl3-mediated cyclization: Synthesis at room temperature of N-alkenyl derivatives of perhydro-1,4,5-oxa(and thia)diazepine-3,6-dione and of 6,7-diazaspiro[3.4]octane-5,8-dione
Heteroatom Chemistry 1999, Volume 10, Issue 7 , Pages 615 - 621
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http://www3.interscience.wiley.com/cgi-bin/fulltext/67501068/PDFSTART
