Citation:
LI Wei-Jie, XU Zun-Le. Synthesis and Application of 3,4-Dihydroxy-2,5-bis(2'-(4'-substitutedoxazolinyl)) furan[J]. Chinese Journal of Applied Chemistry,
;2005, 22(12): 1316-1319.
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Three 3,4-dihydroxy-2,5-bis(2'-(4'-substitutedoxazolinyl))furans were synthesized in yields of(90%~94%) from 3,4-dihydroxy-2,5-furan dicarboxylic acid or its dimethyl ester with chiral β-amino alcohol via a one-step reaction,and their chemical structures were determined by 1H NMR,IR,MS,and elemental analysis.With these chiral bisoxazoline ligands,the asymmetric reduction of β-acetonaphthalene by KBH4 or NaBH4 was preliminarily studied.The enantiomeric excess of the reduction product was up to 83.2% using cyclohexane as the solvent,n(ligand):n(reductive agent):n(β-acetonaphthalene)=0.04:1.6:1,and 72 h reaction time at 0℃,and furan-containing bisoxazoline with 4-benzyl on oxazoline rings exhibited higher enantioselectivity than congeneric bisoxazolines with 4-ethyl on oxazoline rings.
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