Gold catalysis: benzanellation versus alkylidenecyclopentenone synthesis
摘要:
A series of different furan-yn-ols were prepared by a three-step sequence. Their reaction with Gagosz's catalyst Ph3PAuNTf2 depends strongly on the substitution pattern of the Substrate and the quality of the leaving group. Benzofurans, alkylidenecyclopentenones or Meyer-Schuster type products can be obtained. Improving the leaving group quality leads to the preferred formation of benzofurans. (C) 2009 Elsevier Ltd. All rights reserved.
Gold catalysis: benzanellation versus alkylidenecyclopentenone synthesis
作者:A. Stephen K. Hashmi、Michael Wölfle
DOI:10.1016/j.tet.2009.08.074
日期:2009.10
A series of different furan-yn-ols were prepared by a three-step sequence. Their reaction with Gagosz's catalyst Ph3PAuNTf2 depends strongly on the substitution pattern of the Substrate and the quality of the leaving group. Benzofurans, alkylidenecyclopentenones or Meyer-Schuster type products can be obtained. Improving the leaving group quality leads to the preferred formation of benzofurans. (C) 2009 Elsevier Ltd. All rights reserved.
Wittig rearrangement of allyl and propargyl furfuryl ethers leading to 2-furylmethanol derivatives
The first example of the Wittig rearrangement of furfuryl ethers is presented and its application to the preparation of 3-(2-furyl)-3-hydroxy-2-methylpropionates is described.