Synthesis of benzofurans through coupling of dienylacetylenes with carbene complexes: total synthesis of egonol
作者:Jianwei Zhang、Yi Zhang、Yanshi Zhang、James W Herndon
DOI:10.1016/s0040-4020(03)00823-8
日期:2003.7
The reaction of various carbene complexes with dienylacetylenes has been examined. The reaction has been used as the cornerstone for the preparation of the nor-neolignan natural product egonol in five steps from readily available components. In most examples of the carbene-alkyne coupling, the reaction proceeds to form benzofuran derivatives. In the case of one highly functionalized terminal alkyne, a competing rearrangement/cyclization process occurs in preference to the carbene coupling process. The use of silylated alkynes subverts this process. (C) 2003 Elsevier Science Ltd. All rights reserved.
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