Isomerisation of 1-methylene-2-methyl-2-(2-oxopropyl)-cyclohexanes to 2-methylene-1-methyl-1-(2-oxopropyl)-cyclohexanes by ene and retro-ene reaction
作者:Adusumilli Srikrishna、Somepalli Venkateswarlu、Sankuratri Nagaraju、Kathiresan Krishnan
DOI:10.1016/s0040-4020(01)85350-3
日期:1994.1
Thermal activation of the normal Claisen products, the enones 4, 7 and 14 in the presence of a catalytic amount of propionic acid generated the isomeric enones 6, 9 and 15 via the sequential intramolecular ene-reaction of the enol tautomer followed by 1,5-hydrogen transfer (or retro ene-reaction) of the resultant acetyl cyclopropane intermediate. Conversion of the enones 9 and 15 into the corresponding
正常克莱森产物的热活化,烯酮4,7和14中的丙酸催化量的存在所产生同分异构的烯酮6,9和15通过互变异构体,随后1,5烯醇的连续分子内烯反应所得乙酰基环丙烷中间体的-氢转移(或逆烯反应)。将烯酮9和15转化成相应的环己酮10和16,建立了重排产物的结构。