VERBOOM, W.;VAN, EIJK P. J. S. S.;CONTI, P. G. M.;REINHOUDT, D. N., TETRAHEDRON, 45,(1989) N0, C. 3131-3138
作者:VERBOOM, W.、VAN, EIJK P. J. S. S.、CONTI, P. G. M.、REINHOUDT, D. N.
DOI:——
日期:——
2-(1-Alkenyl)- and 2-aryl-substituted four-membered cyclic nitrones as precursors for 2,3,4-substituted pyridines and quinolines
作者:W. Verboom、P.J.S.S. Van Eijk、P.O.M. Conti、D.N. Reinhoudt
DOI:10.1016/s0040-4020(01)80139-3
日期:1989.1
Reaction of the 2-(1-alkenyl)-substituted four-membered cyclic nitrones 3 with KOtBu gave the corresponding α,β-γ,δ-unsaturated oximes 6 which were converted into the substituted pyridines 9, either by azeotropic removal of water in refluxing benzene or by reactfon in a 1:1 mixture of acetic anhydride and acetic acid at room temperature. Treatment of pyridine 9c with boron tribromide afforded the benzopyrano[4