cyclocondensation of an aryl iodide with N-tosyl-2-(prop-2′-ynyloxy)aniline at room temperature is shown to constitute a convenient general method for the synthesis of (E)-3-arylidene-3,4-dihydro-2H-1,4-benzoxazines in moderate to very good yields. The method could also be extended to the synthesis of (E)-3-arylidene-2H-naphth[1,2-b][1,4]oxazines. The regio- and stereo-selectivity of the process, short reaction time
室温下
钯催化芳基
碘化物与N-
甲苯磺酰基-2-(prop-2'-乙氧基)
苯胺的环缩合反应是合成(E)-3-芳基-3,4的简便方法-二氢-2 H -1,4-苯并恶嗪,产率中等至非常高。该方法还可以扩展到(E)-3-亚芳基-2 H-
萘[1,2- b ] [1,4]恶嗪的合成。该方法的区域和立体选择性,较短的反应时间,操作简便以及使用廉价的起始原料代表了其吸引人的特征。