| Project/Area Number |
10671988
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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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 |
OTAKA Akira Kyoto University, Graduate school of Pharmaceutical Sciences, Associate Professor, 薬学研究科, 助教授 (20201973)
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| Co-Investigator(Kenkyū-buntansha) |
TAMAMURA Hirokazu Kyoto University, Graduate school of Pharmaceutical Sciences, Assistant Professor, 薬学研究科, 講師 (80217182)
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| Project Period (FY) |
1998 – 1999
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| Project Status |
Completed (Fiscal Year 1999)
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| Budget Amount *help |
¥3,000,000 (Direct Cost: ¥3,000,000)
Fiscal Year 1999: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1998: ¥2,000,000 (Direct Cost: ¥2,000,000)
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| Keywords | リン酸化ペプチド / 非水解性リン酸化アミノ酸 / ホスファターゼ / クロスカップリング反応 / 不斉補助基 |
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| Research Abstract |
Phosphorylation and dephosphorylation of proteins serve as post-translational modifications that are critical for intracellular signal transudation. Therefore, nonhydrolyzable phosphoamino acid mimetic-containing peptides have gained much attention as useful agents for exploring signaling events. Among various nonhydrolyzable phosphoamino acid analogs, those employing the difluoromethylene unit (CF2) as a replacement for the phosphoryl ester oxygen have shown particular utility. We have already achieved the synthesis of CF2-substituted pTyr and pSer mimetics; however, synthesis of 2-amino-4, 4-difluoro-3-methy1-4-phosphonobutanoic acid (F2Pmab) as a CF2-substituted pThr mimetic was lacing. In this study, we accomplished the preparation of racemic protected F2Pmab by CeCl3-mediated conjugate addition of diethyl difluoromethylphosphonate anion onto a nitroalkene. Furthermore, we accomplished the stereoselective synthesis of all four F2Pmab isomers by applying Cu-mediated coupling reaction of (diethylphosphonodifluoromethyl) -zinc bromide with β-iodo-α, β- unsatureted carboxylic acid derivatives, followed by diastereoselective hydrogenation and amination with the aid of a chiral auxiliary. The protected amino acid derivative was successfully incorporated into peptides using a two-step deprotection methodology consisting of high acidic-and low acidic reagents. For high acidic reagents, 1 M TMSOTf-thioanisole in TFA system was used, and 0.3 M
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