作者:Haye Min Ko、Chung Whan Lee、Hyung Kyoo Kwon、Hea Seung Chung、Soo Young Choi、Young Keun Chung、Eun Lee
DOI:10.1002/anie.200805266
日期:2009.3.16
reaction of an alkynyl boronate with an alkene derivative as well as a radical cyclization reaction of a homopropargylic β‐alkoxyacrylate are the key transformations in the totalsynthesis of the cytotoxic macrolide (−)‐amphidinolide K.
Unexpected stereochemical tolerance for the biological activity of tyroscherin
作者:Hyun Seop Tae、John Hines、Ashley R. Schneekloth、Craig M. Crews
DOI:10.1016/j.bmc.2011.01.027
日期:2011.3
Here we describe the concise syntheses of the 15 diastereomers and key analogs of the natural product tyroscherin. While systematic analysis of the analogs clearly demonstrated that the hydrocarbon tail is important for biological activity, structure-activity relationship studies of the complete tyroscherin diastereoarray revealed a surprisingly expansive stereochemical tolerance for the cytotoxic activity. Our results represent a departure from the tenet that biological activity is constrained to a narrow pharmacophore, and highlight the recently emerging appreciation for stereochemical flexibility in defining the essential structural elements of biologically active small molecules. (C) 2011 Elsevier Ltd. All rights reserved.
Structure, Synthesis, and Biological Properties of Kalkitoxin, a Novel Neurotoxin from the Marine Cyanobacterium <i>Lyngbya </i><i>m</i><i>ajuscula</i>
作者:Min Wu、Tatsufumi Okino、Lisa M. Nogle、Brian L. Marquez、R. Thomas Williamson、Namthip Sitachitta、Frederick W. Berman、Thomas F. Murray、Kevin McGough、Robert Jacobs、Kimberly Colsen、Toshinobu Asano、Fumiaki Yokokawa、Takayuki Shioiri、William H. Gerwick
DOI:10.1021/ja005526y
日期:2000.12.1
An expeditious total synthesis of kalkitoxins: determination of the absolute stereostructure of natural kalkitoxin
作者:Fumiaki Yokokawa、Toshinobu Asano、Tatsufumi Okino、William H. Gerwick、Takayuki Shioiri
DOI:10.1016/j.tet.2004.06.014
日期:2004.8
Kalkitoxin, a potent neurotoxin isolated from the marine cyanobacteria Lyngbyamajuscula, and its congeners (1–7) were efficiently synthesized utilizing Hruby's diastereoselective 1,4-addition and the Wipf's oxazoline-thiazoline conversion as key steps. These synthetic efforts in combination with spectral studies of natural kalkitoxin clearly determined the absolute stereostructure of kalkitoxin to