2018年7月6日
Dynamic Kinetic Resolution of N-Protected Amino Acid Esters via Phase-Transfer Catalytic Base Hydrolysis
ACS Catalysis
- 巻
- 8
- 号
- 7
- 開始ページ
- 5708
- 終了ページ
- 5713
- DOI
- 10.1021/acscatal.8b00693
Copyright © 2018 American Chemical Society. Asymmetric base hydrolysis of α-chiral esters with synthetic small-molecule catalysts is described. Quaternary ammonium salts derived from quinine were used as chiral phase-transfer catalysts to promote the base hydrolysis of N-protected amino acid hexafluoroisopropyl esters in a CHCl3/NaOH (aq) via dynamic kinetic resolution, providing the corresponding products in moderate to good yields (up to 99%) with up to 96:4 er. Experimental and computational mechanistic studies using DFT calculation and pseudotransition state (pseudo-TS) conformational search afforded a TS model accounting for the origin of the stereoselectivity. The model suggested π-stacking and H-bonding interactions play essential roles in stabilizing the TS structures.
- リンク情報
- ID情報
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- DOI : 10.1021/acscatal.8b00693
- eISSN : 2155-5435
- SCOPUS ID : 85047455460