Synthesis of Geminal Enediynes with Saturated and Unsaturated Carbocyclic Backbones by Palladium-Catalyzed Alkynylation of Dibromoolefins
作者:Richard Neidlein、Moritz Winter
DOI:10.1055/s-1998-6094
日期:1998.9
Reductive Bergman-Type Cyclizations of Cross-Conjugated Enediynes to Fulvene and Fulvalene Anions: The Role of the Substituent
作者:Noach Treitel、Lior Eshdat、Tuvia Sheradsky、Patrick M. Donovan、Rik R. Tykwinski、Lawrence T. Scott、Henning Hopf、Mordecai Rabinovitz
DOI:10.1021/ja0566477
日期:2006.4.1
Various cross-conjugated enediynes undergo "Bergman-type" cycloaromatizations upon reduction with potassium metal, generating anions of fulvenes and fulvalene derivatives. This new anionic cyclization is considerably more facile than the classic Bergman cyclization with linear enediynes, creating highly reactive diradicals at -78 degrees C. Not all cross-conjugated enediynes yield cyclized dianions