Vinyl azides in heterocyclic synthesis. Part 5. Thermal and photochemical decomposition of azidocinnamates containing ortho-cycloalkylidene substituents
作者:Christopher J. Moody、Graham J. Warrellow
DOI:10.1039/p19870000913
日期:——
ortho-cycloalkylidene azidocinnamates (2b–e) in boiling toluene gives the indeno[1,2-b]tetrahydroazirines (8), derived by intramolecular ene reaction involving the CN bond of the intermediate 2H-azirines (11), as the major product. The intramolecular ene reaction is a highly favourable process, and also occurs at ca. 40 °C when the azirines (11) are formed by irradiation of the azides (2), although photochemical
在沸腾的甲苯中加热邻-亚环烷基叠氮吲哚酸酯(2b - e),得到茚并[1,2- b ]四氢叠氮化物(8),其是通过分子内烯反应涉及中间体2 H-叠氮基的C N键(11)制得的,作为主要产品。分子内烯反应是非常有利的过程,并且也发生在约200℃ 。当通过叠氮化物(2)的辐照形成叠氮化物(11)时,温度为40°C),尽管叠氮基的光化学开环确实存在竞争。仅当通过环亚烷基双键的环氧化消除了这种分子内烯反应的可能性时,才能以任何程度形成亚乙烯基衍生的产物,环氧叠氮化物(7)以高收率得到4-取代的吲哚(14)。