Journal
RUSSIAN JOURNAL OF ORGANIC CHEMISTRY
Volume 41, Issue 8, Pages 1222-1227Publisher
MAIK NAUKA/INTERPERIODICA/SPRINGER
DOI: 10.1007/s11178-005-0321-9
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Reactions of 3-Z-aroylmethylene-6-chloro-3,4-dihydro-2H-1,4-benzoxazine-2-ones with oxalyl chloride afford 3-aroyl-8-chloro-1,2-dihydro-4H-pyrrolo[2,1-c][1.4]benzoxazine-1,2,4-triones and Z-3-(2-aryl-2-chlorovinyl)-6-chloro-2H-1,4-benzoxazine-2-ones. Aroyl(imidoyl)ketenes generated by decarbonylation of pyrrolobenzoxazinetriones undergo dimerization through [4+2]-cycloaddition to form 4-aroyl-3)-aroyloxy-2-(2-oxo-2H-1,4-benzoxazin-3-yl)-1H,5H-pyrido[2,1-c] [ 1,4]benzoxazine-1,5-diones.
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