RT info:eu-repo/semantics/article T1 New route to pyrido[1,2-b]pyridazinium inner salts. Evidence of a 1,3-dipolar cycloaddition-ring expansion process A1 Valenciano Martínez, Jesús A1 Cuadro Palacios, Ana María A1 Vaquero López, Juan J. A1 Álvarez-Builla Gómez, Julio K1 N-aminides K1 Betaines K1 Rearrangement K1 1,3/1,4-dipoles K1 Westphal condensation K1 As-triazines K1 Derivatives K1 Ciencia K1 Química orgánica K1 Science K1 Chemistry, organic AB 2-Alkoxycarbonylpyridinium N-aminides behave as 1,3-dipoles when reacted with Michael accepters, giving rise to the corresponding cycloadducts which, depending on their regioisomeric nature, subsequently undergo a ring expansion to give pyrido[1,2-b]pyridazinium inner salts. PB Pergamon SN 0040-4039 YR 1999 FD 1999 LK http://hdl.handle.net/10017/3479 UL http://hdl.handle.net/10017/3479 LA eng NO Comisión Interministerial de Ciencia y Tecnología - CICYTE DS MINDS@UW RD 29-mar-2024