Abstract
The reactions of 2-ethoxy-3-phenylbenzo[d]-1,3,2-oxazaphosphorin-6-one with R-carbonylcarboxylic acids ethyl esters (R = CF3, Ph, and Me) lead to the formation of seven-membered heterocycles, 2-ethoxy-9-ethoxycarbonyl-2,8-dioxo-3-phenyl-9-R-benzo[d]-1,3,2-oxazaphosphepines.
GRAPHICAL ABSTRACT
![](/cms/asset/83e17b61-2983-49c2-ad03-6fb8cfc62e5d/gpss_a_743139_o_uf0001.gif)
Acknowledgments
Financial support from RFBR (grant 10-03-00525) is gratefully acknowledged.