Two-step electrochemical annulation for the assembly of polycyclic systems

Org Lett. 2002 Oct 17;4(21):3763-5. doi: 10.1021/ol026771k.

Abstract

[reaction: see text] 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.