Two-Step Electrochemical Annulation for the Assembly of Polycyclic Systems
作者:Christopher R. Whitehead、E. Hampton Sessions、Ion Ghiviriga、Dennis L. Wright
DOI:10.1021/ol026771k
日期:2002.10.1
[GRAPHIC]A two-step electrochemical annulation has been developed for the preparation of fused furans. The process involves an initial conjugate addition of a furyethyl cuprate and trapping of the enolate as the corresponding silyl enolether. The second step of the annulation involves the anodic coupling of the furan and the silyl enol ether to form a six-membered ring.
Electrooxidative Coupling of Furans and Silyl Enol Ethers: Application to the Synthesis of Annulated Furans
作者:Jeffrey B. Sperry、Christopher R. Whitehead、Ion Ghiviriga、Ryan M. Walczak、Dennis L. Wright
DOI:10.1021/jo049889i
日期:2004.5.1
The preparation of annulated furan systems as key synthetic intermediates through the application of a two-step annulation involving an electrochemical ring closure between a furan and a silylenolether has been studied. The reaction was shown to be quite general for the formation of six-membered rings in good yields and was tolerant of a variety of different functional groups. The ring closure was