conversion of allyl homoallyl ethers to gamma,delta-unsaturated carbonylcompounds. For example, treatment of 1-allyl-1-allyloxycyclohexane in the presence of catalytic amounts of [Ir(cod)Cl](2), PCy(3), and Cs(2)CO(3) in toluene at 100 degrees C afforded 4-cyclohexyliden-2, 3-dimethylbutanal in 74% yield. The reaction presumably proceeds through double bond migration to allyl vinyl ethers, which then
Ammar, Hamed Ben; Le Notre, Jerome; Salem, Mansour, European Journal of Inorganic Chemistry, 2003, # 22, p. 4055 - 4064
作者:Ammar, Hamed Ben、Le Notre, Jerome、Salem, Mansour、Kaddachi, Mohamed T.、Toupet, Loic、Renaud, Jean-Luc、Bruneau, Christian、Dixneuf, Pierre H.
DOI:——
日期:——
Synthesis of Spiro Ethers by Ring Closing Metathesis
作者:Martin E. Maier、Michael Bugl
DOI:10.1055/s-1998-1943
日期:1998.12
Starting from the cyclic ketones 1 a - d, the dienes 3 a - e were prepared. The ring closing metathesis reaction of these dienes using the Grubbs catalyst 5 provided the corresponding spiro ethers 4 a - e in good yield. Force field calculations indicate that the conformer with the oxygen in axial position is favored.
从环酮 1 a - d 开始,制备二烯 3 a - e。使用格拉布斯催化剂 5 对这些二烯进行闭环偏析反应,可以得到相应的螺醚 4 a - e,收率很高。力场计算表明,氧处于轴向位置的构象更受青睐。