cyclobutenediones and an aza-Wittig method. A new synthetic route to N-alkyl derivatives is also presented. This involves O-alkylation of 3-alkylamino-1,2-cyclobutenediones using Meerwein’s reagent and subsequent deprotonation under non-hydrolytic conditions. Lithium organyls were found to add to the remaining carbonyl group. The resulting tertiary alcohols undergo ring enlargement on heating in xylene to give
据报道,具有N-(杂)芳基取代的亚
氨基
环丁烯酮的合成有两种途径:以
环丁二烯为起始的加成/取代序列和aza-Wittig方法。还提出了合成N-烷基衍
生物的新途径。这涉及使用Meerwein试剂对3-烷基
氨基-1,2-
环丁二烯进行O-烷基化,然后在非
水解条件下进行去质子化。发现
锂有机基团加到剩余的羰基上。生成的叔醇在二
甲苯中加热后进行扩环反应,分别从4-
乙烯基,4-芳基和4-炔基衍
生物得到4-
氨基苯酚,
4-氨基-1-萘酚或环戊基环化的
喹啉。