Synthesis of the proposed structure of tyroscherin, a growth inhibitor of IGF-1-dependent cancer cells, was succeeded by one-pot Julia coupling. However, spectral data of the synthetic compound were not identical with those of natural tyroscherin. The stereochemistry of tyroscherin was revised to be 2S,3R,8R,10R by syntheses of stereoisomers.
Synthesis of the proposed structure of tyroscherin, a growth inhibitor of IGF-1 -dependent cancer cells, was succeeded by one-pot Julia Coupling. However, spectral data of the synthetic compound were not identical with those of natural tyroscherin. The stereochemistry of tyroscherin is revised to be 2S,3R,8R,10R by syntheses of stereoisomers. Synthetic tyroscherin showed more potent activity than its stereoisomers against IGF-1-dependent cancer cells. (C) 2009 Elsevier Ltd. All rights reserved.
Synthesis of (2<i>RS</i>,8<i>R</i>,10<i>R</i>)-YM-193221 and an Improved Approach to Tyroscherin, Bioactive Natural Compounds from <i>Pseudallescheria</i> <b>sp.</b>
Short-step syntheses of (2RS,8R,10R)-YM-193221 (1) and tyroscherin (2), which are biologically active compounds isolated from Pseudallescheria sp., were accomplished in six and eight steps from L-tyrosine. The relative stereochemistry of natural YM-193221 was determined to be 8R *,10R *.