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Volumn , Issue 13, 2008, Pages 1969-1972

Fast and efficient preparation of an α-fucosyl building block by reductive 1,2-benzylidene ring-opening reaction

Author keywords

Benzylidene; Building block; Carbohydrates; Fucose; Protecting group

Indexed keywords

1,2 BENZYLIDENE; ALPHA FUCOSYL; BENZYLIDENE DERIVATIVE; FUCOSE; LEWIS ACID;

EID: 49649129726     PISSN: 09365214     EISSN: None     Source Type: Journal    
DOI: 10.1055/s-2008-1077961     Document Type: Article
Times cited : (5)

References (41)
  • 20
    • 24444458550 scopus 로고
    • Universität Konstanz: Germany
    • (a) Windmüller, R. Diplomarbeit; Universität Konstanz: Germany, 1990.
    • (1990) Diplomarbeit
    • Windmüller, R.1
  • 37
    • 49649083167 scopus 로고    scopus 로고
    • 4-Di-0-benzoyl-1,2-0-benzylidene-a-L- fucopyranose (6) To a stirred solution of fucosyl bromide 5 (16.9 g, 31.3 mmol, 1.00 equiv) in abs. MeCN (106 mL) was added dry KI (7.46 g, 44.9 mmol, 1.43 equiv) and NaBH4 (1.13 g, 29.9 mmol, 0.96 equiv, The mixture was stirred for 2.5 h. Then more NaBH4 (1.13g, 29.9 mmol, 0.96 equiv) was added. After a total reaction time of 5 h, the solvent was removed. The residue was dissolved in EtOAc, washed with ice water, cold sat. NaHCO3 solution, and twice with brine. The mixture was dried (Na 2SO4, concentrated, and the residue purified by column chromatography (SiO2; pentane-EtOAc, 5:1) to afford 10.2 g (71, of 6 as a colorless foam. Analytical Data of the exo-Product IR (KBr, 2985,1727,1602,1452,1280cm-1. 1HNMR(SOO MHz, CDCl3, δ, 1.31 (d, J= 6.2 Hz, 3 H, 4.51 dd
    • 7Na: 483.14142; found: 483.14160.
  • 38
    • 49649112756 scopus 로고    scopus 로고
    • 4-Di-O-benzoyl-2-0-benzyl-α/ β-L-fucopyranose (7) To a stirred solution of benzylidene fucose 6(161 mg, 0.35 mmol, 1.0 equiv) in abs. THF (2 mL) BH3-THF (0.53 mL, 0.53 mmol, 1.5 equiv) was added at r.t, then Bu2BOTf (52 μL, 0.053 mmol, 0.15 equiv, The mixture was stirred for 1-2 h. Water was added and the reaction mixture was extracted with EtOAc. The organic phase was dried (Na 2SO4, concentrated, and the residue purified by column chromatography (SiO2; pentane-EtOAc, 3:1 to 2:1, to afford 72 mg (45, of 7 and 70 mg (43, of 8 as a colorless foam. The two products were easily separable (7 is much more polar than 8, Analytical Data of the Anomeric Mixture (1:1) of 7 IR (film, 3434, 2936, 1726, 1602, 1453, 1283 cm-1. 1H NMR (300 MHz, CDCl3, δ, 1.19 (d, J= 6.1 Hz, 3 H, 1.27 (d, J= 6.1 Hz, 3 H, 3.38 br s, 1
    • 7Na: 485.15707; found: 485.15705.
  • 40
    • 49649128020 scopus 로고    scopus 로고
    • Analytical Data of the a-Anomer [α]D20 -148.4 (c 1.90, CDCl3, IR (film, 2943, 2867, 1733, 1672, 1464, 1278 cm-1. 1H NMR (300 MHz, CDCl3, δ, 1.24 (d, J= 6.1 Hz, 3 H, 4.29 (dd, J= 7.8, 3.4 Hz, 1 H, 4.55 (m, 1 H, 4.61 (d, J= 7.8 Hz, 1 H, 4.69 (d, J= 7.8 Hz, 1 H, 4.75-5.81 (m, 2 H, 6.68 (d, J= 3.4 Hz, 1 H, 7.23-7.33 (m, 7 H, 7.43-7.49 (m, 3 H, 7.62 (m, 1 H, 7.80 (m, 2 H, 7.94 (m, 2 H, 8.66 (s, 1 H, 13C NMR 75 MHz, CDCl3, δ, 16.2, 67.8, 70.3, 71.7, 72.3, 72.6, 91.2, 94.5, 127.8, 127.9, 127.9, 128.0, 128.2, 128.3, 128.5, 129.4, 129.5, 129.6, 129.7, 133.0, 133.3, 137.4, 161.4, 165.5, 165.7. ESI-HRMS: m/z calcd for C29H26Cl3NO7Na: 628.06725; found: 628.06734
    • 7Na: 628.06725; found: 628.06734.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.