Conformational locking of the glycosyl acceptor for stereocontrol in the key step in the synthesis of heparin
Conformational locking of the glycosyl acceptor for stereocontrol in the key step in the synthesis of heparin
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DOI:
10.1002/1521-3773(20020617)41:12
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发表时间:
2002-01-01
影响因子:
16.6
通讯作者:
Seeberger, PH
中科院分区:
文献类型:
--
作者:
Orgueira, HA;Bartolozzi, A;Seeberger, PH
[7] P. Kaszynski, Collect. Czech. Chem. Commun. 1999, 64, 895.[8] a) K. Basœe, S. Herœmanek, B. SœtÃbr, Chem. Ind.(London) 1977, 951; b) K. Basœe, B. SœtÃbr, J. Dolansky, J. Duben, Collect. Czech. Chem. Commun. 1981, 46, 2345.[9] a) Crystal structure data for C25H25B6I2P: Mr à 675.08, white crystal, size 0.2¬ 0.18¬ 0.10 mm3, triclinic, space group P1≈, a à 7.9841 (6), b à 13.2428 (9), c à 13.5646 (9)‰, a à 96.149 (6), b à 92.686 (5), g à 92.994 (6) 8, Và 1422.02‰ 3, Tà 293 (2) K, Z à 2, 1calcd à 1.577 Mg m¿ 3, F (000) à 652, m (MoKa) à 2.28 mm¿ 1, Data collected with a Siemens P4 four-circle diffractometer (MoKa radiation l à 71.073 pm, graphite monochromator); qmax à 258. A total of 6152 reflections were measured, 4986 unique (Rint à 0.0277). Absorption correction empirical (by Y-scans), min./max. transmission coefficients 0.2453/0.2990, GoF on F 2 was 1.125, R1 (I> 21 (I)) à 0.0358, wR2 à 0.0924. Data/restrains/parameters 4956/0/308. Largest difference Fourier peak and hole 1.511 and¿ 1.173 e‰¿ 3. Refinement used SHELXTL V. 5.1 (GM Sheldrick, SHELXS-97, University of Gˆttingen, Gˆttingen (Germany), 1997). b) CCDC-175525 (4, 5-I2-4¿ PPh4 á). contains the supplementary crystallographic data for this paper. These data can be obtained free of charge via www. ccdc. cam. ac. uk/conts/retrieving. html (or from the Cambridge Crystallographic Data Centre, 12, Union Road, Cambridge CB21EZ, UK; fax:(á44) 1223-336-033; or deposit@ ccdc. cam. ac. uk).[10] RE Williams, Adv. Inorg. Chem. Radiochem. 1976, 18, 67.[11] P. v. R. Schleyer, K. Najafian, Inorg. Chem. 1998, 37, 3454.[12] a) All calculations used the Gausian94 program package [13] and were performed on the Power Challenge XL computer of the Supercomputing Center of the Charles University in Prague (Czech Republic). The calculations were carried out at the self-consistent field (SCF) level and employed a II Huzinaga basis set,[14] well-suited for the calculations of magnetic properties.[15] Additionally, the structure of 4¿ was optimized using a hybrid functional B3LYP with