An Inverse Electron Demand Azo-Diels-Alder Reaction of o-Quinone Methides and Imino Ethers: Synthesis of Benzocondensed 1,3-Oxazines
Dmitry V. Osipov, Vitaly A. Osyanin*, Guzel' D. Khaysanova, Elvira R. Masterova, Pavel E. Krasnikov and Yuri N. Klimochkin
*Department of Organic Chemistry, Chemical Technological Faculty, Samara State Technical University, 244 Molodogvardeyskaya Street, Samara 443100, Russian Federation, Email: vosyaninmail.ru
D. V. Osipov, V. A. Osyanin, G. D. Khaysanova, E. R. Masterova, P. E. Krasnikov, Y. N. Klimochkin, J. Org. Chem., 2018, 83, 4775-4785.
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The reaction of o-quinone methide precursors with imino ethers provides a versatile route to substituted 1,3-benzoxazines via imino-Diels-Alder reaction and elimination. This cascade process is a rare example of the participation of imino ethers as dienophiles.
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benzo fused O-heterocycles, benzo fused N-heterocycles, Diels-Alder reaction