α-Substituted cyclopentanones or cyclohexanones with a carbonyl function at the 4- or 5-position of the side chain were converted to bicycloenones under acetalization conditions (BF3/ethylene glycol).
Acid-catalyzed rearrangements of some 1,6-diketones
作者:Shirong Zhu、Shaun Pardi、Theodore Cohen
DOI:10.1016/s0040-4039(00)01712-3
日期:2000.12
reflux, undergo ring cleavage and formation reactions to give 4-(1-cyclopentenyl)butanoic acids. When the starting ring is six-membered instead, a bicyclic enone results. Mechanistic discussion and some experimental tests are put forth.
当2-(4-酮烷基)环戊烷酮在回流下经受1 MH 2 SO 4的作用时,发生环裂解和形成反应,得到4-(1-环戊烯基)丁酸。当起始环为六元环时,会生成双环烯酮。进行了机理讨论和一些实验测试。
MIYAO, YOSHIHIRO;TANAKA, MASAKAZU;SUEMUNE, HIROSHI;SAKAI, KIYOSHI, J. CHEM. SOC. CHEM. COMMUN.,(1989) N0, C. 1535-1536
Differential carbosubstitution resulted from stepwise triflation and coupling in spiro[4,4]-nonane-1,6-dione. Catalytic hydrogenation of the 1,6-diphenyl-1,6-diene gave the cis,cis-disubstituted spirane. Metal hydride reduction of intermediate monoketone gave mainly the cis-alcohol.