| Project/Area Number |
17550094
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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 |
Synthetic chemistry
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| Research Institution | University of Tsukuba |
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Principal Investigator |
MIURA Katsukiyo University of Tsukuba, Graduate School of Pure and Applied Sciences, Associate Professor (20251035)
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| Co-Investigator(Kenkyū-buntansha) |
HOSOMI Akira University of Tsukuba, Professor Emeritus (00004440)
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| Project Period (FY) |
2005 – 2007
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| Project Status |
Completed (Fiscal Year 2007)
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| Budget Amount *help |
¥3,930,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥330,000)
Fiscal Year 2007: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2006: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 2005: ¥1,600,000 (Direct Cost: ¥1,600,000)
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| Keywords | Platinum / Indium / Environmentally Benign Synthesis / Silicon Reagent / Allylation / Cyclic Ether / Radical Reaction / Conjugated Enone / ビニルシラン / アリルシラン / α,β-不飽和ケトン / アルキン / パラジウム / 二官能基化 / クロスカップリング / タンデム反応 / エン型反応 / 触媒反応 / ヒドロシラン / ラジカル反応 / シリルエノラート |
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| Research Abstract |
We have developed new reactions using platinum and indium catalysts for environmentally benign organic synthesis as shown below.
1. Allylation of Carbon Electrophiles with Vinylsilanes: It was found that vinylsilanes were smoothly isomerized to allylsilanes under catalysis by platinum salts. This isomerization was successfully utilized for allylation of carbon electrophiles with vinylsilanes, which is more convenient than the known method using allylsilanes because of easy access to vinylsilanes.
2. Annulation between Alkenols and Aldehydes: In the presence of catalytic amounts of PtCl_2 and AgOTf, 5-methyl-5-hexen-1-ols reacted efficiently with aldehydes to give tetrahydropyrans (THPs). This annulation is useful for atom-economical, stereoselective synthesis of multi-substituted THPs.
3. Allylation of Acetals with Alkenes: The PtCl_2-AgX catalyst system enabled an ene-type allylation of acetals with 1, 1-disubstituted alkenes. This allylation provides a convenient, direct route to homoallyl ethers.
4. Radical Reactions of Haloalkanes with Hydrosilanes: It was found that a catalytic amount of In (Oac)_3 effectively promoted radical reduction of haloalkanes with PhSiH_3 under very mild reaction conditions. The In (Oac)_3-PhSiH_3 system was successfully utilized for radical addition of haloalkanes to alkenes. The present method is environmentally more benign than the known method using toxic organotin hydrides.
5. Carbonyl Metathesis-type Reaction of Alkynes with Aldehydes: The In (Otf)_3-catalyzed reaction of arylalkynes with aromatic aldehydes gave chalcones in good yield. The carbonyl metathesis-type reaction could be applied to an efficient cyclization of alkynals.
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