Synthesis of 2,4-Diaryl-3,4-dihydro-2H-naphth[2,1-e][1,3]oxazines and Study of the Effects of the Substituents on Their Ring-Chain Tautomerism
作者:István Szatmári、Tamás A. Martinek、László Lázár、Ferenc Fülöp
DOI:10.1002/ejoc.200300753
日期:2004.5
4-dihydro-2H-naphth[2,1-e][1,3]oxazines were prepared through the ring-closure reactions of the starting aminonaphthols with aromatic aldehydes, which proved to furnish three-component (ring1−open−ring2) tautomeric mixtures in CDCl3 at 300 K. The electronic effects of the 2-aryl groups on the ratios of the ring-chain tautomeric forms at equilibrium could be described by Equation (1). Study of the effects of substituents
许多 2-(α-氨基-Y-取代的-苄基)-1-萘酚盐酸盐是通过方便的曼尼希型氨基烷基化制备的。2,4-二芳基-3,4-二氢-2H-萘[2,1-e][1,3]恶嗪是通过起始氨基萘酚与芳香醛的闭环反应制备的,经证明可提供三-在 300 K 下,CDCl3 中的组分(环 1-开环 2)互变异构混合物。2-芳基对平衡时环链互变异构形式比率的电子效应可以通过方程(1)来描述。研究取代基 X 和 Y 对互变异构平衡的影响 [借助方程 (2) 和 (3) 的多元线性回归分析] 表明,反式链平衡常数受诱导效应 (σF ) 4-苯环上的取代基Y。