Chiral tertiary alpha-hydroxy esters of known stereochemical configuration were transformed to a-azido esters by Mitsunobu reaction with HN3. Optimization of this reaction was shown to proceed at room temperature with high chemical yield using 1,1-(azodicarbonyl)dipiperidine (ADDP) and trimethylphosphine (PMe3). Complete inversion of configuration was observed at the a-carbon. Several alpha,alpha-disubstituted amino acids were synthesized in high overall chemical yield and optical purity.
机构:
Osaka City Univ, Grad Sch Sci, Dept Mat Sci, Sumiyoshi Ku, Osaka 5588585, JapanOsaka City Univ, Grad Sch Sci, Dept Mat Sci, Sumiyoshi Ku, Osaka 5588585, Japan
Ohfune, Y
Shinada, T
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Osaka City Univ, Grad Sch Sci, Dept Mat Sci, Sumiyoshi Ku, Osaka 5588585, JapanOsaka City Univ, Grad Sch Sci, Dept Mat Sci, Sumiyoshi Ku, Osaka 5588585, Japan
机构:
Osaka Prefecture Univ, Dept Biosci & Informat, Grad Sch Life & Environm Sci, Naka Ku, Sakai, Osaka 591, JapanOsaka Prefecture Univ, Dept Biosci & Informat, Grad Sch Life & Environm Sci, Naka Ku, Sakai, Osaka 591, Japan
Kusaka, Shintaro
Hattori, Yoshihide
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Osaka Prefecture Univ, Dept Biosci & Informat, Grad Sch Life & Environm Sci, Naka Ku, Sakai, Osaka 591, JapanOsaka Prefecture Univ, Dept Biosci & Informat, Grad Sch Life & Environm Sci, Naka Ku, Sakai, Osaka 591, Japan
Hattori, Yoshihide
Uehara, Kouki
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Stella Pharma Corp, Chuo Ku, Osaka, JapanOsaka Prefecture Univ, Dept Biosci & Informat, Grad Sch Life & Environm Sci, Naka Ku, Sakai, Osaka 591, Japan
Uehara, Kouki
Asano, Tomoyuki
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Stella Pharma Corp, Chuo Ku, Osaka, JapanOsaka Prefecture Univ, Dept Biosci & Informat, Grad Sch Life & Environm Sci, Naka Ku, Sakai, Osaka 591, Japan
Asano, Tomoyuki
Tanimori, Shinji
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Osaka Prefecture Univ, Dept Biosci & Informat, Grad Sch Life & Environm Sci, Naka Ku, Sakai, Osaka 591, JapanOsaka Prefecture Univ, Dept Biosci & Informat, Grad Sch Life & Environm Sci, Naka Ku, Sakai, Osaka 591, Japan