1,5-Hydrogen shift and other isomerization reactions of certain ethyl octadecatrienoates
作者:Jorma Matikainen、Seppo Kaltia、Markku Hämäläinen、Tapio Hase
DOI:10.1016/s0040-4020(97)00127-0
日期:1997.3
tanoate (CP-1, CP-2, CP-3, CP-4 and CP-5) and 3-(6-pentyl-1,2,3,4,4a,5,6,8a-octahydronaphthyl)propanoate. 1,5-Sigmatropic hydrogen shift reactions of the trienoic esters 4–7, all possessing a conjugated Z,E structure, precede the IMDA reactions. The 1,5-hydrogen shift reaction occurs in Z,E dienoic structures at a lower temperature than the Z,E to E,E isomerization.
合成了四种新的十八碳三烯酸乙酯(4-7)。加热后,这些化合物通过分子内狄尔斯-阿尔德(IMDA)反应进行环化,主要生成4-(5-戊基-1,2,3,3a,4,5,7a-六氢茚基)-丁酸乙酯(CP- 1,CP-2,CP-3,CP-4和CP-5)和3-(6-戊基-1,2,3,4,4a,5,6,8a-八氢萘基)丙酸酯。在IMDA反应之前,均具有共轭Z,E结构的三烯酸酯4-7的1,5-σ氢转移反应。1,5-氢转移反应发生在Z,E二烯结构中,温度低于Z,E - E,E异构化。