Abstract
Synthesis of methyl 2-azido-2-deoxy-4,6-O-benzylidene-β-D-galactopyranoside (1), one of the key components in the synthesis of O-glycoamino acids, was undertaken in order to synthesize Tn and TF(3) antigen building blocks. In pursuit of an alternative approach, benzylidenation of the crude D-galactal (2a) afforded methyl 2-deoxy-4,6-O-benzylidene-α-D-galactopyranoside (3c) and 3,4-O-benzylidene-D-galactal (3b) besides the expected 4,6-O-benzylidene-D-galactal (3a). Formation of compound 3c was explained based on the presence of methyl 2 deoxy-α-D-galactopyranoside (2b) isomer and/or trace amount of methanol in the crude mixture of deacetylated product of 2 prior to benzylidenation. On the other hand, formation of 3b in substantial quantities appears to be a thermodynamically controlled product and its formation is found to be common during prolonged Lewis-acid catalyzed benzylidenation reaction. Crystal structures of these important and useful precursors were deduced by X-ray diffraction methods to enumerate their complete molecular structure as well as to understand the effect of the cyclic acetal on the pyranose ring conformation. Compound 1 crystallizes in the orthorhombic space group P2 1 2 1 2 1 with cell dimensions a = 5.058(7), b = 12.766(7), c = 22.557(7) Å 3b crystallizes in the hexagonal space group P6 1 with cell dimensions a = 18.265(4), b = 18.265(3), c = 6.323(2) Å 3c crystallizes in the monoclinic space group P2 1 with cell dimensions a = 10.614(3), b = 4.963(2), c = 12.730(3) Å, and β = 95.47(3)°.
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Hokomori, S.-I. Adv. Cancer Res. 1989, 52, 257. (b) Varki, A. Glycobiology 1993, 3, 97. (c) Kim, Y.S.; Gum, J.R.; Brockhausen, I. Glycoconjugate J. 1996, 13, 693.
Schachter, H.; Brockhausen, I. In Glycoconjugates: Composition, Structure and Function; Allen, H.J.; Kisailus, E.C.; Eds.; Marcel Dekker: New York, 1992; pp 263–332. (b) Hounsell, E.F.; Davies, M.J.; Renouf, D.V. Glycoconjugate J. 1996, 13, 19.
Strous, G.J.; Dekker, J. CRC Rev. Biochem. Mol. Biol. 1992, 27, 57. (b) Kornfeld, R.; Kornfeld, S. Ann. Rev. Biochem. 1985, 54, 631.
Gururaja, T.L.; Ramasubbu, N.; Levine, M.J. Letts. Pept. Sci. 1996, 3, 79. (b) Satyanarayana, J.; Gururaja, T.L.; Naganagowda, G.A.; Ramasubbu, N.; Levine, M.J. J. Peptide Res. 1998, 52, 165.
Bonchkov, A.F.; Zaikov, G.E. Chemistry of the O-glycosidic bond: Formation and Cleavage; Pergmon Press: Oxford, 1979. (b) Paulsen, H. Chem. Soc. Rev. 1984, 13, 15.
Schmidt, R. R.; Kinzy, W. Adv. Carbohydr. Chem. Biochem. 1994, 50, 21. (b) Paulsen, H. Angew. Chem. 1990, 102, 851. (c) Kunz, H. Angew. Chem. Int. Ed. Engl. 1987, 26, 294.
Evans, M.E. Carbohydr. Res. 1972, 21, 473.
Paulsen, H.; Paal, M. Carbohydr. Res. 1984, 135, 71.
Venugopalan, P.; Burgi, H.B. Helv. Chim. Acta 1994, 77, 1475. (b) Venugopalan, P.; Weiss, R.G.; Venkatesan, K. J. Org. Chem. 1992, 57, 276.
Sheldrick, G.M. In Crystallographic Computing; Sheldrick, G.M.; Kruger, C.; Goddard, R., Eds.; Vol. 3, Oxford Univ. Press: Oxford, 1985. (b) Sheldrick, G.M. SHELXL-93, Program for the Refinement of Crystal Structures; University of Göttingen: Germany, 1993.
Johnson, C.K. ORTEP-II, Report ORNL-5138; Oak Ridge National Laboratory, TN, 1976.
International Tables for X-Ray Crystallography, Kynoch Press: Birmingham, Vol. IV, 1974, Present distributor: Kluwer Academic Publishers, Dordrecht.
Paulsen, H.; Peters, S.; Bielfeldt, T.; Meldal, M.; Bock, K. Carbohydr. Res. 1995, 268, 17.
Clode, D.M. Chem. Rev. 1979, 79, 491.
Richardson, A.C. Carbohydr. Res. 1967, 4, 42.
Blaha, K.; Hermankova, V.; Jary, J.; Zobacova, A. Collection Czechoslov. Chem. Commun. 1972, 37, 4050.
de Belder, A.N. Adv. Carbohydr. Chem. 1965, 20, 219. (b) Gelas, J. Adv. Carbohydr. Chem. 1981, 39, 71.
Buchanan, J.G.; Miller, K.J. Chem. Ind. (London) 1958, 625. (b) Ball, D.H.; Jones, J.K.N. J. Chem. Soc. 1958, 905.
Dobinson, B.; Foster, A.B.; Stacey, M. Tetrahedron Lett. 1959, 1. (b) Evans, M.E.; Parrish, F.W. Tetrahedron Lett. 1966, 3805.
Baggett, N.; Mosihuzzaman, Md.; Webber, J.M. Carbohydr. Res. 1969, 11, 263. (b) Garegg, P.J.; Maron, L.; Swahn, C.-G. Acta Chem. Scand. 1972, 26, 518.
Eklind, K.; Garegg, P.J.; Gotthammar, B. Acta Chem. Scand. 1972, B29, 633.
Garegg, P.J.; Swahn, C.-G. Methods Carbohydr. 1980, VIII, 317.
Lemieux, R.U.; Fraga, E.; Watanabe, K.A. Can. J. Chem. 1968, 46, 61.
Sharma, M.; Brown, R.K. Can. J. Chem. 1966, 44, 2825.
Barili, P.L.; Catelani, G.; Fabrizi, G.; Lamba, D. Carbohydr. Res. 1993, 243, 165.
Barili, P.L.; Berti, G.; Catelani, G.; Colonna, F.; D'Andrea, F. Carbohydr. Res. 1989, 190, 13.
Lamba, D.; Segre, A.L.; Fabrizi, G.; Matsuhiro, B. Carbohydr. Res. 1993, 243, 217.
Jeffrey, G.A.; Pople, J.A.; Binkley, J.S.; Vishveshwara, S. J. Am. Chem. Soc. 1978, 100, 373.
Berman, H.M.; Chu, S.S.C.; Jeffrey, G.A. Science 1967, 157, 1576. (b) Gatehouse, B.M.; Poppleton, B.J. Acta Crystallogr. Sect. B 1971, 27, 654. (c) Jeffrey, G.A. Acta Crystallogr. Sect. B, 1990, 46, 89.
Baggett, N.; Duxbury, J.M.; Foster, A.B.; Webber, J.M. Carbohydr. Res. 1965, 1, 22. (b) Puliti, R.; Mattia, A; Barone, G. Carbohydr. Res. 1988, 182, 148.
Chu, S.S.C.; Jeffrey, G.A. Acta Crystallogr. Sect. B 1968, 24, 830.
Cremer, D.; Pople, J.A. J. Am. Chem. Soc. 1975, 97, 1354. (b) Sundaralingam, M. Biopolymers 1968, 6, 189.
Matias, P.M.; Jeffery, G.A. Carbohydr. Res. 1986, 153, 217.
Arnott, S.; Scott, W.E. J. Chem. Soc. Perkin Trans. 2 1972, 324. (b) Allen, F.H.; Kennard, O.; Watson, D.G.; Brammer, L.; Orpen, A.G.; Taylor, R. J. Chem. Soc. Perkin Trans. 2 1987, S1–S19.
Schwarz, J.C.P. J. Chem. Soc. Chem. Commun. 1973, 505.
Stokhuyzen, R.; Chieh, C. J. Chem. Soc. Perkin Trans 2 1976, 481.
Koll, P.; Saak, W.; Pohl, S.; Steiner, B.; Koos, M. Carbohydr. Res. 1994, 265, 237.
Cano, F.H.; Foces-Foces, C.; Jimenez-Barbero, J.; Alemey, A.; Bernabe, M.; Martin-Lomas, M. Carbohydr. Res. 1988, 175, 119.
Marchessault, R.H.; Perez, S. Biopolymers 1979, 18, 2369.
Guthrie, R.D.; Irvine, R.W.; Davison, B.E.; Henrick, K.; Trotter, J. J. Chem. Soc. Perkin Trans. 2 1981, 468.
Lee, E.; Melody, N.; McArdle, P.; Cunningham, D. Carbohydr. Res. 1991, 219, 229.
Veeneman, G.H.; Notermans, S.; Liskamp, R.M.J.; van der Marel, G.A.; van Boom, J.H. Tetrahedron Lett. 1987, 28, 6695. (b) Douglas, S.P.; Whitfield, D.M.; Krepinsky, J.J. J. Am. Chem. Soc. 1991, 113, 5095. (c)Schuster, M.; Wang, P.; Paulson, J.C.; Wong, C-H. J. Am. Chem. Soc. 1994, 116, 1135.
Danishefsky, S.J.; McClure, K.F.; Randolph, J.T.; Ruggeri, R.B. Science 1993, 260, 1307. (b) Danishefsky, S.J.; Bilodeau, M.T. Angew. Chem. Int. Ed. Engl. 1996, 35, 1380.
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Gururaja, T.L., Venugopalan, P. & Levine, M.J. Crystallographic studies of some cyclic benzylidene acetals: Key synthons for o-glycoamino acid building blocks and solid-phase oligosaccharide synthesis. Journal of Chemical Crystallography 28, 747–759 (1998). https://doi.org/10.1023/A:1021864511771
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DOI: https://doi.org/10.1023/A:1021864511771