The reaction of 2-(tetrazol-5-yl)alkyl ketones and of 2-(tetrazol-5-yl)alkanoic acid derivatives with lead tetraacetate. A novel method of preparation of alk-2-ynyl ketones and alk-2-ynoic acid derivatives †
作者:József Fetter、Ildikó Nagy、Le Thanh Giang、Mária Kajtár-Peredy、Antal Rockenbauer、László Korecz、Gábor Czira
DOI:10.1039/b005286h
日期:——
The majority of tetrazolylacetyl derivatives 2 and 7, when treated with lead tetraacetate in dry 1,4-dioxane at room or lower temperature, are oxidized with elimination of molecular nitrogen mainly to the corresponding alkynoyl derivatives 4 and 8, respectively. Vinylidenes (25) have been shown to be the intermediates of the reaction. The reaction does not take place when either the tetrazolyl group
在干燥条件下用四乙酸铅处理大多数的四唑基乙酰基衍生物2和71,4-二恶烷 在室温或更低温度下被氧化,消除了分子 氮主要分别对应于相应的炔基衍生物4和8。已显示亚乙烯基(25)是反应的中间体。当四唑基被N-取代或将四唑和羰基分开的碳原子被双取代或这两个基团被两个碳原子分开时,该反应不会发生,如化合物17中所述。该反应提供了一种方便的方法,用于通过中间体四唑基乙酰基衍生物将2-氰基乙酰基衍生物转化为烷-2-炔基衍生物。4-甲氧基苯胺7o反应不同,得到稠合的杂环化合物 19o和20o。