Abstract
2-Ethyl-1-phenylindazolium hexafluorophosphate was deprotonated by potassium 2-methyl-butan-2-olate to give the N-heterocyclic carbene of indazole, i.e., indazol-3-ylidene. This N-heterocyclic carbene undergoes a ring transformation to 9-ethylaminoacridine. Trapping of the carbene with sulfur, silver(I) oxide, and carbonylbis(triphenylphosphane)rhodium(I) chloride resulted in the formation of indazolethione, indazolone (X-ray structure analysis), and carbonylbis(triphenylphosphane)(2-ethyl-1-phenyl-1H-indazol-3-ylidene)rhodium(I) hexafluorophosphate (X-ray structure analysis), respectively. Reaction of the indazolium salt with phenolate and thiophenolate gave an N-ethyl-2-(phenylamino)benzimidate and benzimidothioate, respectively.
2-乙基-1-苯基吲唑盐酸六氟磷酸盐被2-甲基丁基醇钾去质子化,形成吲唑的N-杂环卡宾,即吲唑-3-基亚甲基。这种N-杂环卡宾经历环转化成9-乙基氨基蒽啉。用硫、氧化银(I)、羰基双(三苯基膦)铑(I)氯化物捕获卡宾,分别形成吲唑硫醚、吲唑酮(X射线结构分析)和羰基双(三苯基膦)(2-乙基-1-苯基-1H-吲唑-3-基亚甲基)铑(I)六氟磷酸盐(X射线结构分析)。吲唑盐与苯酚盐和硫代苯酚反应分别得到N-乙基-2-(苯基氨基)苯并咪唑和苯并咪唑硫酸酯。