Applied Chemistry for Engineering (공업화학)

The Korean Society of Industrial and Engineering Chemistry (한국공업화학회)
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Synthesis of Highly Enantiomerically Enriched Arenesulfonic Acid 2-Hydroxy Esters via Kinetic Resolution of Terminal Epoxides

속도론적 분할법을 통한 말단 에폭사이드로부터 고광학순도의 아렌술폰산 2-하이드록시 에스터의 합성

  • Lee, Yae Won (Department of Chemical Engineering, Inha University) ;
  • Yang, Hee Chun (Department of Chemical Engineering, Inha University) ;
  • Kim, Geon-Joong (Department of Chemical Engineering, Inha University)
  • Received : 2016.07.08
  • Accepted : 2016.08.16
  • Published : 2016.10.10
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Abstract

This paper describes the very efficient and highly enantioselective ring opening of terminal epoxides with alkyl and arene sulfonic acid. The dinuclear chiral (salen) Co complexes bearing Lewis acids of Al, Ga and In catalyze the reaction enantioselectively in the presence of tetrabutylammonium chloride using tert-butyl methyl ether as a solvent. The variation of the anion of the tetra butyl ammonium salt has significant impact on the reactivity and selectivity of the asymmetric ring opening of phenyl glycidyl ether with p-toluenesulfonic acid. The order of reactivity and selectivity was found to be $Cl^-$ > $l^-$ > $Br^-$ > $OH^-$. Strong synergistic effects of the different Lewis acid centers of Co-Al, Co-Ga and Co-In complexes were observed in the catalytic process. The dinuclear chiral salen catalyst containing $AlCl_3$ was found to be most active and highly enantioselective (91% ee).

본 논문에서는 매우 효과적이고 고광학선택적으로 화합물 중의 말단기에 존재하는 에폭사이드기를 알킬 또는 아렌술폰산으로 여는 방법에 관하여 기고한다. Al, Ga 및 In과 같은 루이스산을 함유하는 이핵성 키랄 코발트살렌 착체는 염화테트라부틸암모늄 존재하에서 터샬리 부틸메틸에테르를 용매로 사용할 때, 이 반응에 대하여 광학선택적으로 높은 촉매활성을 나타내었다. 테트라부틸암모늄염 중의 음이온의 종류에 따라 페닐글리시딜 에테르의 에폭시 고리를 파라-톨루엔술폰산으로 여는 반응에서의 촉매활성과 선택도가 다르게 나타났다. 반응활성과 선택도는 $Cl^-$ > $l^-$ > $Br^-$ > $OH^-$의 순서를 보였다. 서로 다른 루이스 산점을 갖는 Co-Al, Co-Ga 및 Co-In 착체는 촉매반응 중에 높은 상승효과를 나타내었다. $AlCl_3$를 함유한 이핵성 키랄 코발트살렌 착체 촉매가 가장 높은 활성과 91% ee에 이르는 높은 광학선택성을 보였다.

Keywords

References

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  1. Asymmetric Ring-Opening of Epoxides Catalyzed by Metal-Salen Complexes vol.10, pp.6, 2016, https://doi.org/10.3390/catal10060705