Stereoselective Total Syntheses of Polyacetylene Plant Metabolites via Ester-Tethered Ring Closing Metathesis
作者:Bernd Schmidt、Stephan Audörsch
DOI:10.1021/acs.joc.6b02987
日期:2017.2.3
Total syntheses of five naturally occurring polyacetylenes from three different plants are described. These natural products have in common an E,Z-configured conjugated diene linked to a di- or triyne chain. As the key method to stereoselectively establish the E,Z-diene part, an ester-tethered ring-closing metathesis/base-induced eliminative ring opening sequence was used. The results presented herein
描述了来自三种不同植物的五种天然存在的聚乙炔的总合成。这些天然产物共同具有连接至二或三炔链的E,Z-构型的共轭二烯。作为立体选择性地建立E,Z-二烯部分的关键方法,使用了酯束缚的开环复分解/碱基诱导的消除开环序列。本文介绍的结果不仅展示了这种束缚的RCM变体的实用性,而且还提示我们建议应修改或至少重新考虑最初分配自白术的手性聚乙炔的绝对构型。