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Volumn 45, Issue 18, 2004, Pages 3651-3654

A new polymer-supported Evans-type chiral auxiliary derived from α-hydroxy-β-amino acid, phenylnorstatine: Synthesis and application in solid-phase asymmetric alkylation reactions

Author keywords

Asymmetric alkylation; Chiral auxiliary; Evans' oxazolidinone; Phenylnorstatine; Polymer supported; Solid phase

Indexed keywords

3 AMINO 2 HYDROXY 4 PHENYLBUTYRIC ACID; ALPHA HYDROXY BETA AMINO ACID; AMINO ACID DERIVATIVE; OXAZOLIDINONE DERIVATIVE; POLYMER; RESIN; UNCLASSIFIED DRUG;

EID: 1842686330     PISSN: 00404039     EISSN: None     Source Type: Journal    
DOI: 10.1016/j.tetlet.2004.03.043     Document Type: Article
Times cited : (27)

References (29)
  • 2
    • 0003229041 scopus 로고    scopus 로고
    • Solid-Supported Combinatorial and Parallel Synthesis of Small Molecular-Weight Compound Libraries
    • Elsevier, Oxford.
    • Obrecht D., Villalgordo J.M. Solid-Supported Combinatorial and Parallel Synthesis of Small Molecular-Weight Compound Libraries. Tetrahedron Organic Chemistry Series. Vol. 17:1998;Elsevier, Oxford.
    • (1998) Tetrahedron Organic Chemistry Series , vol.17
    • Obrecht, D.1    Villalgordo, J.M.2
  • 16
    • 1842796146 scopus 로고    scopus 로고
    • note
    • Wang resin was purchased from Watanabe Chem. Ind., Ltd (Hiroshima, Japan), loading 0.75 mmol/g, 100-200 mesh, polystyrene with 1% cross linking with divinylbenzene.
  • 17
    • 1842695319 scopus 로고    scopus 로고
    • note
    • Boc-Pns-OH was prepared from H-Pns-OH, which was purchased from Nippon Kayaku (Tokyo, Japan).
  • 20
    • 1842796139 scopus 로고    scopus 로고
    • note
    • 5: C, 68.23; H, 6.20; N, 6.63. Found: C, 67.99; H, 6.20; N, 6.55.
  • 22
    • 1842644968 scopus 로고    scopus 로고
    • note
    • 16 and then the product was purified by preparative TLC for removing nonalkylated carboxylic acid. The resultant pure 7 was next coupled with (S)-phenylethylamine by the EDC-HOBt method to determine the enantiomeric excesses of the α-alkylated carboxylic acids 7 by HPLC.
  • 28
    • 1842695318 scopus 로고    scopus 로고
    • note
    • The crude product 7 was purified by preparative TLC to remove nonalkylated carboxylic acid. The relatively lower yield (38-54%) that was observed in the solid-phase method was due to the fact that the yield includes the four step reaction from Wang resin to the final product 7. The yield for two steps (alkylation and hydrolysis) is likely to be similar to that of the solution-phase method.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.