Total Synthesis and Structure−Activity Investigation of the Marine Natural Product Neopeltolide
作者:Daniel W. Custar、Thomas P. Zabawa、John Hines、Craig M. Crews、Karl A. Scheidt
DOI:10.1021/ja904604x
日期:2009.9.2
The total synthesis and biologicalevaluation of neopeltolide and analogs are reported. The key bond-forming step utilizes a Lewis acid-catalyzed intramolecular macrocyclization that installs the tetrahydropyran ring and macrocycle simultaneously. Independent of each other, neither the macrolide nor the oxazole sidechain substituents of neopeltolide can inhibit the growth of cancer cell lines. The
Enantioselective Synthesis of (−)-Exiguolide by Iterative Stereoselective Dioxinone-Directed Prins Cyclizations
作者:Erika A. Crane、Thomas P. Zabawa、Rebecca L. Farmer、Karl A. Scheidt
DOI:10.1002/anie.201102790
日期:2011.9.19
Three become one: The title compound can be prepared in 26 steps by employing a unified Prinscyclization strategy to construct both tetrahydropyran rings (see scheme). The route combines two similar dioxinone fragments and one aldehyde component to generate the core structure. (−)‐Exiguolide selectively inhibits the growth of A549 cancer cells at low concentrations; the triene side chain and the Z‐enoate