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 †
The majority of tetrazolylacetyl derivatives 2 and 7, when treated with leadtetraacetate 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
Gold-Catalyzed Hydroarylation of <i>N</i>-Aryl Alkynamides for the Synthesis of 2-Quinolinones
作者:Taylor Vacala、Lauren P. Bejcek、Chloé G. Williams、Alexandra C. Williamson、Paul A. Vadola
DOI:10.1021/acs.joc.6b02984
日期:2017.3.3
A mild method for the synthesis of 2-quinolinones via hydroarylation of N-aryl alkynamides is reported. While traditional methods have relied on the use of strong Brønsted or Lewis acids, this report describes the development of mild reaction conditions that yield 2-quinolinones in good to excellent yield using a commercially available gold catalyst. Substrates bearing a variety of functional groups