A Novel Synthetic Route to α-Galactosyl Ceramides and iGb3 Using DTBS-Directed α-Selective Galactosylation

Akiyoshi Kimura; Akihiro Imamura; Hiromune Ando; Hideharu Ishida; Makoto Kiso

doi:10.1055/s-2006-949649

LETTER

A Novel Synthetic Route to α-Galactosyl Ceramides and iGb3 Using DTBS-Directed α-Selective Galactosylation

Akiyoshi Kimura^a, Akihiro Imamura*^a,b, Hiromune Ando^c, Hideharu Ishida^a,b, Makoto Kiso*^a,b
^a Department of Applied Bioorganic Chemistry, Faculty of Applied Biological Sciences, Gifu University, 1-1 Yanagido, Gifu-shi, Gifu 501-1193, Japan
^b CREST, Japan Science and Technology Corporation (JST), 1-1 Yanagido, Gifu-shi, Gifu 501-1193, Japan
^c Division of Instrumental Analysis, Life Science Research Center, Gifu University, 1-1 Yanagido, Gifu-shi, Gifu 501-1193, Japan
Fax: +81(58)2932918; e-Mail: imamu@cc.gifu-u.ac.jp; e-Mail: kiso@cc.gifu-u.ac.jp;

Abstract

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Abstract

A novel synthetic route to α-galactosyl ceramides and isoglobotrihexosylceramide (iGb3), which can activate NKT cells, was developed by exploiting a di-tert-butylsilylene-directed α-selective galactosylation procedure.

Key words

glycolipids - glycosylations - glycosides - galactosylceramides - iGb3

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References

References and Notes

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Compound 13: ¹H NMR (500 MHz, CDCl₃): δ = 0.87 (t, 6 H, 2 × CH₃), 0.96 and 1.11 (2 s, 18 H, 2 t-Bu), 1.24 (m, 52 H, CH₂), 1.65 (q, 2 H, NHCOCH₂CH ₂), 1.86 (m, 2 H, H-5^Cer, H-5′^Cer), 2.20 (t, 2 H, NHCOCH ₂CH₂), 3.70 (dd, 1 H, H-1^Cer), 3.79 (dd, 1 H, H-1′^Cer), 3.95 (s, 1 H, H-5^Gal), 4.25 (s, 2 H, H-6^Gal, H-6′^Gal), 4.60 (m, 1 H, J _2,3 = 3.4 Hz, H-2^Cer), 4.85 (d, 1 H, J _3,4 = 3.2 Hz, H-4^Gal), 5.21 (d, 1 H, J _1,2 = 3.7 Hz, H-1^Gal), 5.32 (m, 1 H, J _3,4 = 4.6 Hz, H-4^Cer), 5.49 (dd, 1 H, J _2,3 = 10.7 Hz, J _3,4 = 3.2 Hz, H-3^Gal), 5.55 (dd, 1 H, J _2,3 = 3.4 Hz, J _3,4 = 4.6 Hz, H-3^Cer), 5.71 (dd, 1 H, J _1,2 = 3.7 Hz, J _2,3 = 10.7 Hz, H-2^Gal), 6.38 (d, 1 H, NH), 7.61 (m, 20 H, 4 × Ph). ¹³C NMR (100 MHz, CDCl₃): δ = 14.1, 20.7, 22.7, 23.3, 25.6, 25.7, 27.1, 27.2, 27.5, 28.8, 29.4, 29.5, 29.6, 29.6, 29.7, 29.7, 31.9, 36.9, 48.8, 66.9, 67.7, 68.5, 69.0, 70.8, 71.1, 72.9, 73.8, 98.5, 128.2, 128.3, 128.4, 128.6, 129.4, 129.5, 129.7, 129.7, 129.8, 130.0, 133.0, 133.3, 165.1, 166.0, 166.2, 166.3, 173.0. Compound 15: ¹H NMR (500 MHz, CDCl₃): δ = 0.88 (t, 6 H, 2 × CH₃), 0.96 and 1.11 (2 s, 18 H, 2 × t-Bu), 1.24 (m, 50 H, CH₂), 1.57 (t, 2 H, NHCOCH₂CH ₂), 1.98 (q, 2 H, H-6^Cer, H-6′^Cer), 2.10 (m, 2 H, NHCOCH ₂CH₂), 3.70 (dd, 1 H, J _gem = 10.7 Hz, J _1,2 = 4.6 Hz, H-1′^Cer), 3.84 (dd, 1 H, J _gem = 10.7 Hz, H-1^Cer), 4.19 (dd, 1 H, J _gem = 12.6 Hz, H-6′^Gal), 3.92 (s, 1 H, H-5^Gal), 4.28 (dd, 1 H, J _gem = 12.6 Hz, H-6^Gal), 4.50 (m, 1 H, J _1,2 = 4.6 Hz, H-2^Cer), 4.88 (d, 1 H, H-4^Gal), 5.28 (d, 1 H, J _1,2 = 3.7 Hz, H-1^Gal), 5.49 (m, 2 H, H-3^Cer, H-4^Cer), 5.56 (dd, 1 H, H-3^Gal), 5.74 (m, 2 H, H-5^Cer, NH), 5.76 (dd, 1 H, J _1,2 = 3.7 Hz, H-2^Gal), 7.66 (m, 15 H, 3 × Ph). ¹³C NMR (100 MHz, CDCl₃): δ = 14.1, 20.7, 22.7, 23.3, 25.8, 27.2, 27.5, 28.9, 29.2, 29.3, 29.4, 29.4, 29.5, 29.5, 29.6, 29.6, 29.7, 29.7, 31.9, 32.3, 36.9, 51.2, 66.8, 67.4, 67.7, 68.5, 70.9, 71.1, 74.4, 97.9, 124.6, 128.2, 128.3, 128.3, 128.4, 129.0, 129.4, 129.6, 129.7, 129.7, 129.8, 129.9, 133.0, 133.1, 133.2, 137.5, 165.2, 166.0, 166.2, 172.7.

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