Diastereoselective Synthesis of Six-Membered Carbocyclic Spirooxindoles<i>via</i>6π-Electrocyclization of 3-Dienylidene-2- oxindoles
作者:Ko Hoon Kim、Hye Ran Moon、Junseong Lee、Jimin Kim、Jae Nyoung Kim
DOI:10.1002/adsc.201500260
日期:2015.5.4
The Wittig reaction of isatin derivatives with Morita–Baylis–Hillman bromides of cinnamaldehydes afforded 3‐dienylidene‐2‐oxindoles. These trienes were converted into the corresponding spirooxindoles in a stereoselective manner in refluxing toluene in good yields. The diastereomeric spirooxindoles could be obtained stereoselectively by adding a catalytic amount of palladium(II) acetatevia the palladium‐catalyzed