4-氧代-4 H -1-苯并吡喃在C-3处具有甲酰基,乙酰基或羧基取代基的异二烯环加成反应会生成3-烷氧基-或3,3-二烷氧基-4, 4a-二氢吡喃并[4,3- b ] [1]苯并吡喃-10-酮,在某些情况下,能够在多种条件下进行多种选择性转化,包括酸诱导的差向异构和/或逆环加成,还原,水解和醇解非常温和的条件。
A route to functionalised 1,5-dicarbonyl systems via heterodiene cycloadditions of a 2-acyl-2-enoic acid
作者:Simon J. Coutts、Timothy W. Wallace
DOI:10.1016/s0040-4039(00)95627-2
日期:——
Chromone-3-carboxylic acid 1 undergoes heterodienecycloadditions to alkoxyalkenes 2, producing novel pyrans which on treatment with alkanols or water decompose into functionalised 1,5-dicarbonyl systems 6 – 11, the sequence being potentially general for 2-acyl-2-enoic acids.
A facile synthesis of 2-alkyl-substituted chromanones from ortho-acylphenols and terminal alkynoates is described. The method contains two consecutive processes in one-pot reaction through a DABCO-catalyzed condensation reaction and a KOBu'-mediated intramolecular cycloaddition to afford the desired products. (C) 2010 Elsevier Ltd. All Fights reserved.
Coutts Simon J., Wallace Timothy W., Tetrahedron, 50 (1994) N 40, S 11755-11780
作者:Coutts Simon J., Wallace Timothy W.
DOI:——
日期:——
COUTTS, SIMON J.;WALLACE, TIMOTHY W., TETRAHEDRON LETT., 28,(1987) N 43, 5195-5198