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Volumn , Issue 10, 2010, Pages 1519-1524

Direct α-Selective glycosylations of acetyl-protected 2-deoxy- and 2,6-dideoxythioglycosides by preactivation protocol

Author keywords

2,6 dideoxysugars; 2 deoxyglycosides; Carbohydrate; Preactivation stereoselective glycosylation

Indexed keywords

2 DEOXYTHIOGLYCOSIDE; 2,6 DIDEOXYTHIOGLYCOSIDE; THIOGLYCOSIDE; UNCLASSIFIED DRUG;

EID: 77953238348     PISSN: 09365214     EISSN: 14372096     Source Type: Journal    
DOI: 10.1055/s-0029-1219943     Document Type: Article
Times cited : (14)

References (64)
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    • 24144468638 scopus 로고    scopus 로고
    • For the use of carbonate functionality, also see, for example
    • For the use of carbonate functionality, also see, for example:, Crich D, Jayalath P, J. Org. Chem. 2005 70 7252
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    • Crich, D.1    Jayalath, P.2
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    • references cited therein
    • Zhu T, Boons G.-J, Org. Lett. 2001 3 4201; and references cited therein
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    • Zhu, T.1    Boons, G.-J.2
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    • 60849098446 scopus 로고    scopus 로고
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    • Crich D, Li L.-F, J. Org. Chem. 2009 74 773; and references cited therein
    • (2009) J. Org. Chem. , vol.74 , pp. 773
    • Crich, D.1    Li, L.-F.2
  • 64
    • 77953251431 scopus 로고    scopus 로고
    • note
    • Typical Glycosylation Procedure Triflic anhydride (11.0 mL, 0.061 mmol) was added to a stirred solution of p-methylphenyl 3,4,6-tri-O-acetyl-2- deoxy-1-thio-a-D-galactopyranoside (1a, 30.0 mg, 0.076 mmol), benzenesulfinyl morpholine (BSM, 12.9 mg, 0.061 mmol), and 4 MS (350 mg, activated powder) in CH2Cl2 (3.0 mL) at 72 C under nitrogen atmosphere. The reaction mixture was stirred for 10 min. After loss of 1a detected by TLC, a solution of methyl 3-O-benzyl-4,6-O-benzylidene-a- D-glucopyranoside (2a, 18.8 mg, 0.051 mmol) in CH2Cl2 (0.5 mL) was added dropwise to the reaction mixture. The mixture was stirred for 30 min, and the reaction was quenched by Et3N (8.0 mL). The precipitate was filtered off, and the filtrate was concentrated. The residue was purified by column chromatography on silica gel (PEEtOAc, 2.5:1) to give methyl 3-O-benzyl-4,6-O-benzylidene-2-O-(3,4,6- tri-O-acetyl-2-deoxy-a-D- galactopyranosyl)-a-D-glucopyranoside (3a, 27.6 mg, 84% yield) as a foam. Rf = 0.35 (PEEtOAc, 1.5:1). 1H NMR (500 MHz, CDCl3): d = 7.50 (dd, 2 H, J = 2.0, 7.5 Hz), 7.407.33 (m, 7 H), 7.297.27 (m, 1 H), 5.60 (s, 1 H), 5.37 (ddd, 1 H, J = 3.0, 5.0, 12.5 Hz), 5.15 (d, 1 H, J = 3.0 Hz), 5.14 (d, 1 H, J = 3.5 Hz), 4.93 (d, 1 H, J = 10.5 Hz), 4.89 (d, 1 H, J = 3.5 Hz), 4.71 (d, 1 H, J = 10.5 Hz), 4.36 (t, 1 H, J = 6.5 Hz), 4.31 (dd, 1 H, J = 4.5, 10.0 Hz), 3.98 (t, 1 H, J = 9.5 Hz), 3.90 (dd, 1 H, J = 6.5, 11.0 Hz), 3.873.74 (m, 4 H), 3.65 (t, 1 H, J = 9.5 Hz), 3.43 (s, 3 H), 2.132.08 (m, 4 H), 2.00 (s, 3 H), 1.961.92 (m, 4 H). 13C NMR (125 MHz, CDCl3): d = 170.13, 170.23, 169.79, 138.06, 137.26, 128.96, 128.54, 128.47, 128.25, 127.86, 125.95, 101.27, 97.12, 94.10, 82.71, 76.85, 75.74, 73.45, 69.00, 66.61, 65.87, 62.25, 61.87, 55.23, 29.86, 20.81, 20.70. MS (ESI-TOF, positive): m/z = 667 [M + Na]+. Anal. Calcd for C33H40O13: C, 61.48; H, 6.25. Found: C, 61.65; H, 6.40.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.