Abstract
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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Translated from Zhurnal Organicheskoi Khimii, Vol. 41, No. 8, 2005, pp. 1245–1250.
Original Russian Text Copyright © 2005 by Semenova, Krasnykh.
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Semenova, T., Krasnykh, O. Chemistry of Acyl(imidoyl)ketenes: IX. Synthesis and Thermolysis of 3-Aroyl-8-chloro-1,2-dihydro-4H-pyrrolo[2,1-c][1,4]benzoxazine-1,2,4-triones. Russ J Org Chem 41, 1222–1227 (2005). https://doi.org/10.1007/s11178-005-0321-9
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DOI: https://doi.org/10.1007/s11178-005-0321-9