reactivity of alkoxycarbonyl- and cyanoenynes in the homo-benzannulation of conjugatedenynes. The introduction of these electron-withdrawing groups enabled us to carry out the benzannulation of 1-substituted enynes as well as 1,2- and 2,4-disubstituted enynes, which have much lower reactivity compared to 2- or 4-monosubstituted enynes. Polysubstituted benzenes were prepared in a highly regioselective manner
Pd-Catalyzed One-Pot Multicomponent Coupling Reaction for the Highly Regioselective Synthesis of Polysubstituted Benzenes
作者:Chanjuan Xi、Chao Chen、Jie Lin、Xiaoyin Hong
DOI:10.1021/ol047553p
日期:2005.1.1
Tetrasubstituted benzenes can be efficiently synthesized in a regioselective manner from alkynes and 2-bromoacrylates by palladium-catalyzed cascade Sonogashira coupling-benzannulation reaction.
Enhanced Reactivity of Electron-Deficient Enynes in the Palladium-Catalyzed <i>homo</i>-Benzannulation of Conjugated Enynes
We report the high reactivity of electron-deficient enynes in the homo-benzannulation of conjugatedenynes in the presence of Pd(PPh3)4. The introduction of electron-withdrawing groups enabled us to carry out the benzannulation of 1-substituted enynes as well as 1,2- and 2,4-disubstituted enynes. Polysubstituted benzenes were prepared in a highly regioselective manner in good to excellent yields.