The annulation of phthalides with α-alkyl/arylacrylates in the presence of LDA/LHMDS is shown to directly give alkyl/aryl-1-naphthols. The method involving a novel dealkoxycarbonylation obviates the regiochemical issues in the synthesis of polysubstituted naphthalenes, and it forms the key step in a three-step total synthesis of arnottin I, a naphthobenzopyranone natural product.
Bismuth triflate catalyzed Claisen rearrangement of allyl naphthyl ethers
作者:Thierry Ollevier、Topwe M. Mwene-Mbeja
DOI:10.1016/j.tetlet.2006.03.193
日期:2006.6
Bismuth triflate was found to be an efficient catalyst for the Claisenrearrangement of allyl naphthyl ethers. The reaction proceeds smoothly with a catalytic amount of bismuth triflate (20 mol %) to afford the corresponding ortho-allyl naphthol in moderate to good yields in most cases.