Asymmetric Synthesis of Stagonolide-D and Stagonolide-G
作者:Tridib Mahapatra、Tapas Das、Samik Nanda
DOI:10.1246/bcsj.20100197
日期:2011.5.15
First asymmetric synthesis of the naturally occurring epoxy noneolide stagonolide-D has been reported in this article. Ring-closing metathesis (RCM) by Grubbs second generation catalyst, Sharpless asymmetric epoxidation (SAE), and cis-selective Horner–Wadsworth–Emmons (HWE) olefination by Ando method are the key reactions successfully employed to achieve the target molecule in a divergent approach. Structurally related small ring macrolide stagonolide-G has also been synthesized by employing RCM and a metal–enzyme combined dynamic kinetic resolution (DKR) strategy starting from (S)-ethyl lactate as a chiral pool.
The Total Synthesis and Structural Revision of Stagonolide D
作者:Paresh M. Vadhadiya、Vedavati G. Puranik、C. V. Ramana
DOI:10.1021/jo202138g
日期:2012.3.2
The totalsynthesis of the putative structure of stagonolide D has been completed. The relative and absolute configuration of stagonolide D was established by synthesizing its optical antipode. The adopted strategy involves the construction of the central macrolide employing ring-closing metathesis (RCM), followed by selective protecting group manipulations and a final concomitant −OTBS deprotection