Synthesis and Biological Activity of Kalkitoxin and its Analogues
摘要:
Total syntheses of kalkitoxin, isolated from the Caribbean Lyngbya majuscula, and its analogues, 3-epi-, 7-epi-, 8-epi-, 10-epi-, 10-nor-, and 16-nor-kalldtcocin, were achieved via oxazolidinone-based diastereoselective 1,4-addition reaction of a methyl group and efficient T1C14-mediated thiazoline ring formation as the key steps. The biological activities of synthetic kalkitoxin and its analogues were evaluated with brine shrimp.
Synthesis and Biological Activity of Kalkitoxin and its Analogues
摘要:
Total syntheses of kalkitoxin, isolated from the Caribbean Lyngbya majuscula, and its analogues, 3-epi-, 7-epi-, 8-epi-, 10-epi-, 10-nor-, and 16-nor-kalldtcocin, were achieved via oxazolidinone-based diastereoselective 1,4-addition reaction of a methyl group and efficient T1C14-mediated thiazoline ring formation as the key steps. The biological activities of synthetic kalkitoxin and its analogues were evaluated with brine shrimp.
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
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