研究生: |
張俊偉 Chun-Wei Chang |
---|---|
論文名稱: |
以Ketopinic amide衍生物與鈦離子形成之錯合物應用於不對稱催化□醇化與□胺化之研究 Ketopinic Amide/Ti(IV) Complex Catalyzed Asymmetric Addition of TMSCN to Aldehydes and Aldimines. |
指導教授: |
汪炳鈞教授
Dr. Biing-Jiun Uang |
口試委員: | |
學位類別: |
碩士 Master |
系所名稱: |
理學院 - 化學系 Department of Chemistry |
論文出版年: | 2000 |
畢業學年度: | 88 |
語文別: | 中文 |
中文關鍵詞: | 不對稱 、催化 、鈦 |
外文關鍵詞: | titanium, catalyst, catalyzed, asymmetric, cyanohydrin, aminonitrile, cyanide |
相關次數: | 點閱:2 下載:0 |
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本論文主要以Ketopinic amide為骨架的掌性配位基16與四異丙基鈦所形成的掌性催化劑,應用在不對稱□醇化反應及不對稱□胺化反應上的研究。在不對稱□醇的合成方面:以15 mol%催化量的催化劑在-78℃的低溫下及分子篩粉末等反應條件下,催化芳香族□醇或脂肪族□醇的生成,其鏡像超越值皆有94~99%的高度選擇性,產率則介於50~80%左右。相較於其它的催化系統,我們所開發的催化劑無論對於芳香醛或脂肪醛仍然都有相當不錯的結果。在不對稱□胺的合成方面:在相同的條件下,這個反應的反應性相當好,但是並沒有辦法誘導出任何的不對稱選擇性。
Asymmetric syntheses of cyanohydrins and aminonitriles were carried out by using chiral ligand 16/Ti(IV) complex at low temperature. Camphor based ligand 16 was prepared from Ketopinic acid chloride with optically pure (R,R)-diphenylethylene diamine, followed by stereoselective reduction with L-Selectride® in 2 steps. Ligand 16 was stable under acidic and basic conditions, and was easily recovered by recrystallization.
In asymmetric synthesis of cyanohydrins, the active catalyst was prepared from 16.5mol% of chiral ligand 16 and 15 mol% of Ti(OiPr)4 in the presence of molecular sieve 4Å in nonpolar solvent . Both aromatic and aliphatic cyanohydrins were produced in modest yield with excellent enantioselectivity (95~99% e.e.) at -78℃. In addition, Asymmetric Strecker type synthesis has been tested in the same fashion as above. Unfortunately, the 16/Ti(IV) that has been successfully applied to the catalytic asymmetric synthesis of cyanohydrins was not suitable for the catalytic asymmetric synthesis ofα-aminonitriles.
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