Furan-2(3H)- and -2(5H)-ones. Part 6. Di-π-methane rearrangement of the α-substituted 4-benzylfuran-2(5H)-one system
作者:Osamu Muraoka、Genzoh Tanabe、Mié Higashiura、Toshie Minematsu、Takefumi Momose
DOI:10.1039/p19950001437
日期:——
The effect of the ‘central methane’ substitution on the di-π-methane rearrangement in 4-benzyl-2,5-dihydrofuran-2-ones 8a–d was investigated. Significant enhancement of efficiency in the rearrangement leading in high combined yields to two isomeric products, endo-12 and exo-12, is discussed in terms of both the substituent effects at the benzylic carbon and the restrained features of the ring-enrolled
研究了“中央甲烷”取代对4-苄基-2,5-二氢呋喃-2-酮8a - d中二-π-甲烷重排的影响。讨论了重排效率的显着提高,导致高收率合成了两个异构体,endo - 12和exo - 12,分别针对苄基碳上的取代基效应和环式π系统的受限制特征进行了讨论。 。化学选择性差异的起因与3-芳基化合物5的光芳基化产物6相比 还研究了光辐照产生的结果,并通过假定烯酮系统的β位置具有更高的反应性进行了合理化。