Imidazolium-modified poly(l-leucine) catalyst: an efficient and recoverable catalyst for Juliá-Colonna reactions

Tetrahedron Letters

Volumn 50, Issue 37, 2009, Pages 5225-5227

  Qiu, Wenwei ^a   He, Linmei ^a   Chen, Qi ^a   Luo, Wanrong ^a   Yu, Zhichao ^a   Yang, Fan ^a   Tang, Jie ^a  

^a EAST CHINA NORMAL UNIVERSITY   (China)

Author keywords

Asymmetric epoxidation; Chalcone; Imidazolium; Poly (l leucine)

Indexed keywords

4 METHOXYCHALCONE; CHALCONE DERIVATIVE; IMIDAZOLE DERIVATIVE; KETONE DERIVATIVE; LEUCINE; POLYAMINOACID; POLYLEUCINE; UNCLASSIFIED DRUG;

ARTICLE; CATALYSIS; CATALYST; CHEMICAL REACTION; ENANTIOSELECTIVITY; EPOXIDATION; JULIA COLONNA REACTION; REACTION ANALYSIS; REACTION TIME; SYNTHESIS;

EID: 67650886513     PISSN: 00404039     EISSN: None     Source Type: Journal    
DOI: 10.1016/j.tetlet.2009.06.127     Document Type: Article

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23. 2D) for [3-apmim]X-PLL (n = 10) ppm: 9.38 (1H, proton of imidazolium), 8.19 (1H, proton of imidazolium), 8.07 (1H, proton of imidazolium).
24. 4, and were then evaporated in vacuo and purified by silica gel column chromatography (AcOEt/petroleum 1:10-1:30) to afford the corresponding epoxide. The enantiomeric excess was determined by chiral-phase HPLC analysis on a Chiralpak AD column (eluent 10% i-PrOH in hexane, UV detection at 254 nm).