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collected at 291(2) K using graphite-monochromated Mo K
a
(k = 0.71073 Å), 1.07° < h < 25.00° for 7 and 0.87° < h < 25.00° for 8,
respectively. The structures were solved by a direct method, and ex-
panded by using Fourier techniques. The non-hydrogen atoms were
refined anisotropically. Hydrogen atoms were included but not re-
fined. All calculations were performed using the teXsan crystallo-
graphic software package. Crystal data for 7: triclinic P1,
7. Burguete, M. I.; Collado, M.; Escorihuela, J.; Luis, S. V. Angew. Chem., Int. Ed.
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Asymmetry 2004, 15, 1289; (b) Wang, M.-C.; Liu, L.-T.; Zhang, J.-S.; Shi, Y.-Y.;
Wang, D.-K. Tetrahedron: Asymmetry 2004, 15, 3853; (c) Wang, M.-C.; Hou,
X.-H.; Xu, C.-L.; Liu, L.-T.; Li, G.-L.; Wang, D.-K. Synthesis 2005, 3620; (d)
Wang, M.-C.; Zhao, W. X.; Wang, X.-D.; Song, M. P. Synlett 2006, 3443; (e)
Wang, M.-C.; Zhang, Q.-J.; Zhao, W. X.; Wang, X.-D.; Ding, X. J. Org. Chem.
2008, 73, 168; (f) Wang, M.-C.; Zhang, Q.-J.; Li, G.-W.; Liu, Z.-K. Tetrahedron:
Asymmetry 2009, 20, 288; (g) Niu, J.-L.; Wang, M.-C.; Lu, L.-J.; Ding, G.-L.; Lu,
H.-J.; Chen, Q.-T.; Song, M.-P. Tetrahedron: Asymmetry 2009, 20, 2616.
13. Wang, M.-C.; Liu, Z.-K.; Li, S.; Ding, X.; Li, Y.; Tang, M.-S. Tetrahedron:
Asymmetry 2010, 21, 486.
a = 5.8386(12) Å,
a = 92.43(3)°, b = 8.7672(18) Å, b = 91.28(3)°, c =
19.138(4) Å,
c
= 106.83(3)°, V = 936.1(3) Å3; formula unit C23H23
NO with Z = 2, Dcalcd = 1.169 g cm-3, F(0 0 0) = 352,
l(Mo Ka) =
0.071 mmꢀ1. Full-matrix least-squares refinement on F2 based on
2988 independent reflections (Rint = 0.0000) converged with 460
parameters. Final R indices [I > 2
indices (all data): R1 = 0.0601, wR2 = 0.1452; GoF = 1.009. Crystal
data for 8: monoclinic C2, a = 27.495(6) Å, = 90.00(0)°, b = 5.92
63(12) Å, b = 113.02(3)°, c = 25.415(5) Å, = 90.00(0)°, V = 3811.3
(13) Å3; formula unit C23H23NO with Z = 8, Dcalcd = 1.448 g cm-3
F(0 0 0) = 1408, (Mo K
) = 0.069 mmꢀ1. Full-matrix least-squares
refinement on F2 based on 5624 independent reflections (Rint
0.0000) converged with 460 parameters. Final R indices [I > 2 (I)]:
indices (all data): R1 = 0.0873,
r(I)]: R1 = 0.0534, wR2 = 0.1382; R
a
c
,
l
a
=
r
R1 = 0.0695, wR2 = 0.1706;
wR2 = 0.1847; GoF = 1.089.
R
14. (a) Hoffmann, R. W. Angew. Chem., Int. Ed. Engl. 1992, 31, 1124; (b) Hoffmann, R.
W. Angew. Chem., Int. Ed. 2000, 39, 2054.
15. Bulman Page, P. C.; Allin, S. M.; Maddocks, S. J.; Elsegood, M. R. J. J. Chem. Soc.,
Perkin Trans. 1 2002, 36, 2827.
Acknowledgments
16.
L
-Serine is commercially available at 50.32 RMB/g (25 g = 1258 RMB) while the
corresponding -enantiomer is at 6.64 RMB/g (1 kg = 6643 RMB) from Aldrich
Chemical Company, 2007–2008.
We are grateful to the National Natural Sciences Foundation of
China (NNSFC: 20672102 and 20972140), and Henan Outstanding
Youth Program (084100410001) for the financial support.
D
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