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Total synthesis of natural products using a desymmetrization strategy
Authors:Makoto Inai  Tomohiro Asakawa  Toshiyuki Kan
Affiliation:1. School of Pharmaceutical Sciences, University of Shizuoka, 52-1 Yada, Suruga-ku, Shizuoka 422-8526, Japan;2. Institute of Innovative Science and Technology, Tokai University, 4-1-1, Kitakaname, Hiratsuka-city, Kanagawa 259-1292, Japan
Abstract:
Total syntheses of SB-203207 (1) and sphingofungin E (2) were accomplished by utilizing an asymmetric desymmetrization strategy to introduce multiple stereogenic centers into meso starting compounds in a single step. Thus, rhodium carbenoid-mediated C/>H insertion into <strong>3</strong> provided the bicyclo[3.3.0]framework <strong>4</strong> for <strong>1</strong>, while organocatalyst-mediated bromolactonization of <strong>5</strong> afforded <strong>6</strong> for the synthesis of <strong>2</strong>. Similarly, we utilized desymmetric rhodium nitrenoid-mediated aziridination reaction of <strong>5</strong> to obtain a key intermediate required for a total synthesis of pactamycin (<strong>29</strong>), a complex aminocyclopentitol antibiotic featuring six contiguous stereogenic centers.</td>
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Keywords:Total synthesis  Desymmetrization  SB-203207  Sphingofungin E  Pactamycin
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