| |
[摘要]：The total synthesis of (-)-dactylolide and formal synthesis of (-)-zampanolide via target oriented b-C-glycoside formation is described. The two key reactions involved a stereoselective redn. of the appropriate oxocarbenium cation and a highly chemo- and diastereoselective ring-closing metathesis protocol for the formation of the macrocyclic core. In addn. to the described chem., in vitro screening of the antipode of natural dactylolide against the NCI's 60 cancer cell line helped to illuminate the crit. importance of the N-acyl hemi-aminal 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 (25-99 ng/mL) range against the four cell lines HL-60, K-562, HCC-2998, and SF-539, while displaying modest LC50 values. |
|
