Total Synthesis of ()-Dactylolide and Formal Synthesis of ()-Zampanolide via Target Oriented β- C -Glycoside Formation

阅读量:

31

作者:

F DingMP Jennings

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摘要:

The total synthesis of ()-dactylolide and formal synthesis of ()-zampanolide via target oriented β-C-glycoside formation is described. The two key reactions involved a stereoselective reduction of the appropriate oxocarbenium cation and a highly chemo- and diastereoselective ring-closing metathesis protocol for the formation of the macrocyclic core. In addition to the described chemistry, in vitro screening of the antipode of natural dactylolide against the NCI's 60 cancer cell line helped to illuminate the critical importance of the N-acyl hemiaminal side chain of natural zampanolide for its reported potent nanomolar cytotoxicities. Furthermore, by means of the in vitro screen of ()-dactylolide, a promising cancer therapeutic lead has now emerged for a variety of carcinomas. More specifically, ()-dactylolide exhibited GI50 values in the nanomolar (2599 ng/mL) range against the four cell lines HL-60, K-562, HCC-2998, and SF-539, while displaying modest LC50 values.

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DOI:

10.1021/jo8009853

被引量:

98

年份:

2008

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