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 *.
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.
Total Synthesis and Biological Evaluation of Tyroscherin
作者:Hyun Seop Tae、John Hines、Ashley R. Schneekloth、Craig M. Crews
DOI:10.1021/ol101801u
日期:2010.10.1
The efficient synthesis and biological evaluation of both the reported and revised structures of tyroscherin have been achieved. Central to our synthesis is a cross metathesis reaction that generated the trans-olefin regioselectively. This synthetic strategy enabled the facile manipulation of tyroscherin stereochemistry, facilitating the generation of all 16 tyroscherin diastereomers and a photoactivatable tyroscherin-based affinity probe for future mode of action studies.
Synthesis and structure revision of tyroscherin, and bioactivities of its stereoisomers against IGF-1-dependent tumor cells
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.
Antifungal profile against Candida auris clinical isolates of tyroscherin and its new analog produced by the deep-sea-derived fungal strain Scedosporium apiospermum FKJ-0499