Reactivite de lithiens derives d'ethers de la cyanhydrine du benzaldehyde vis-a-vis d'α-enones cycliques
作者:Nadine Seuron、Jacqueline Seyden-Penne
DOI:10.1016/0040-4020(84)85069-3
日期:1984.1
Conjugate addition of reagent 1A to 2-cyclohexenone 3 can be realized in THF-HMPT, so that one-pot conjugate addition—CH3I enolate trapping, leading to trans 2-methyl 3-benzoylcyclohexanone 17 can be easily performed. From isophorone 4 and Δ1(9)-2-octalone 5, 1, 4-addition under kinetic control is observed in THF. In the presence of HMPA, the reaction is under thermodynamic control. At low temperatures
可以在THF-HMPT中将试剂1A共轭添加到2-环己烯酮3中,从而可以容易地进行一锅共轭添加-CH 3 I烯醇化物的捕获,从而导致反式2-甲基3-苯甲酰基环己酮17。由异佛尔酮4和Δ 1(9) -2- octalone 5,1,4-加成动力学控制下在THF中观察到。在HMPA存在下,反应在热力学控制下。在低温下,烯醇盐19a与1A和4处于平衡状态; 从4在0°或5在-65°或0°时,平衡位于起始原料的一侧。在任何溶剂中1A和6之间都不会发生反应。