[Zn(OCH2C6H5)((dimethylamino)ethanol)]2 | 235422-38-5

• 英文名称: [Zn(OCH2C6H5)((dimethylamino)ethanol)]2
• CAS: 235422-38-5
• 化学式: C₂₂H₃₄N₂O₄Zn₂
• 分子量: 521.303
• InChiKey: RTTSWTMJSXMWGG-UHFFFAOYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  None
• 重原子数：
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• 可旋转键数：
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• 环数：
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• sp3杂化的碳原子比例：
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• 拓扑面积：
  None
• 氢给体数：
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• 氢受体数：
  None

反应信息

• 作为反应物：
  描述：

  [Zn(OCH2C6H5)((dimethylamino)ethanol)]2 、 三乙氧基硅烷 以 乙二醇二甲醚 为溶剂， 生成 [ZnH((dimethylamino)ethanol)]2 、 benzyloxy(triethoxy)silane
  参考文献：
  名称：

  Enantioselective Reduction of Ketones by Polymethylhydrosiloxane in the Presence of Chiral Zinc Catalysts

  摘要：

  Enantioselective reduction of ketones, particularly acetophenones, by polymethylhydrosiloxane (PMHS) to the corresponding secondary alcohols can be achieved with high yields and enantiomeric excesses (ee's) up to 88% in the presence of chiral zinc catalysts (eq 1). Two catalytic systems have been developed giving similar ee's: (i) System A: ZnEt2 + chiral diimine or diamine 1-10, (ii) System B: Zn(carboxylate)(2) + chiral diamine activated by Vitride. System B is inexpensive, stable, and ready to use in toluene, providing either (R) or (S) chiral secondary alcohols with 70-80% ee in the presence of (S,S)- or (R,R)-N,N'-ethylenebis-(1-phenylethylamine) (ebpe, 6). The reduction has been carried out at the 1 kg scale without scale-up problems. The ligand is cheap and is recovered at the end of reaction by simple distillation from residues of the organic phase. Both precursors ZnMe2.(S,S)-ebpe (A) and Zn(dea)2 (S,S)-ebpe(B) for systems A and B, respectively, have been isolated and characterized by X-ray structure and exhibit the same catalytic properties and the same ee's for the reduction of acetophenone as the in situ prepared catalytic system. The complex ZnEt2 (S,S)-ebpe) (A') reacts with benzaldehyde to give the seven-membered ring dimer complex La in which benzaldehyde inserts into the Zn-N bond of complex A'. Acetophenone also reacts with A' to give a similar seven-membered ring dimer complex Lb. Both La and Lb are catalysts for the enantioselective reduction of acetophenone by PMHS and gave activities and ee's similar to those of A'. Synthetic and mechanistic aspects of this new economical method are discussed in this paper.

  DOI：

  10.1021/ja990522i
• 作为产物：
  描述：

  [ZnH((dimethylamino)ethanol)]2 、 苯甲醛 以 乙二醇二甲醚 为溶剂， 生成 [Zn(OCH2C6H5)((dimethylamino)ethanol)]2
  参考文献：
  名称：

  Enantioselective Reduction of Ketones by Polymethylhydrosiloxane in the Presence of Chiral Zinc Catalysts

  摘要：

  Enantioselective reduction of ketones, particularly acetophenones, by polymethylhydrosiloxane (PMHS) to the corresponding secondary alcohols can be achieved with high yields and enantiomeric excesses (ee's) up to 88% in the presence of chiral zinc catalysts (eq 1). Two catalytic systems have been developed giving similar ee's: (i) System A: ZnEt2 + chiral diimine or diamine 1-10, (ii) System B: Zn(carboxylate)(2) + chiral diamine activated by Vitride. System B is inexpensive, stable, and ready to use in toluene, providing either (R) or (S) chiral secondary alcohols with 70-80% ee in the presence of (S,S)- or (R,R)-N,N'-ethylenebis-(1-phenylethylamine) (ebpe, 6). The reduction has been carried out at the 1 kg scale without scale-up problems. The ligand is cheap and is recovered at the end of reaction by simple distillation from residues of the organic phase. Both precursors ZnMe2.(S,S)-ebpe (A) and Zn(dea)2 (S,S)-ebpe(B) for systems A and B, respectively, have been isolated and characterized by X-ray structure and exhibit the same catalytic properties and the same ee's for the reduction of acetophenone as the in situ prepared catalytic system. The complex ZnEt2 (S,S)-ebpe) (A') reacts with benzaldehyde to give the seven-membered ring dimer complex La in which benzaldehyde inserts into the Zn-N bond of complex A'. Acetophenone also reacts with A' to give a similar seven-membered ring dimer complex Lb. Both La and Lb are catalysts for the enantioselective reduction of acetophenone by PMHS and gave activities and ee's similar to those of A'. Synthetic and mechanistic aspects of this new economical method are discussed in this paper.

  DOI：

  10.1021/ja990522i