| Project/Area Number |
14370721
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Chemical pharmacy
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| Research Institution | Kyoto University |
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Principal Investigator |
KAWABATA Takeo Kyoto University, Institute for Chemical Research, Professor, 化学研究所, 教授 (50214680)
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| Co-Investigator(Kenkyū-buntansha) |
TSUBAKI Kazunori Kyoto University, Institute for Chemical Research, Associate Professor, 化学研究所, 助教授 (50303897)
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| Project Period (FY) |
2002 – 2004
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| Project Status |
Completed (Fiscal Year 2004)
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| Budget Amount *help |
¥13,800,000 (Direct Cost: ¥13,800,000)
Fiscal Year 2004: ¥4,100,000 (Direct Cost: ¥4,100,000)
Fiscal Year 2003: ¥3,800,000 (Direct Cost: ¥3,800,000)
Fiscal Year 2002: ¥5,900,000 (Direct Cost: ¥5,900,000)
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| Keywords | nucleophilic catalysts / acylation / kinetic resolution / regioselectivity / desymmetrization / remote asymmetric induction / acceleration / 不斉求核触媒 / エナンチオ選択性 / 基質特異性 / 不斉非対称化 / π-π相互作用 / ピロリジノピリジン / 気質特異性 / C_2-対称 |
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| Research Abstract |
Organocatalysis has been the focus of curent synthetic attention due to environmental benignity and the mild reaction conditions. We have developed a chiral 4-pyrrolidinopyridine (PPY) analogue which has no chiral elements near the catalytically active pyridine nitrogen. Nevertheless, this catalyst shows high enantioselectivity (s=10〜54) in the kinetic resolution of racemic amino alcohols with a p-dimethylaminobenzoyl protective group. In this research project, the mechanism for the enantioselective acylation and enantioselective acceleration was clarified. The rate of acylation of an amino alcohol derivative with the catalyst was found 12 times as fast as that with PPY. C_2-symmetric chiral PPY analogues were also developed. A key intermediate, 2,5-dicarboxyl-N-pyridyl-pyrrolidine, was obtained via a five-step sequence starting from L-glutamic acid. Combinatorial introduction of the functional side chains at C(2) and C(5) is readily achieved, thus, construction of a small library of chiral C_2-symmetric PPYs was accomplished. All of these new PPY analogues showed high catalytic activity for acylation of alcohols, because of no steric congestion near the catalytically active pyridine nitrogen. They showed excellent selectivity in acylative asymmetric desymmetrization of cyclic meso-diols at room temperature.
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