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0037185538
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There are no examples for the stereoselective preparation of 5,6-disubstituted piperazinones, and only two examples of the preparation of a racemate and mixture of diastereomers have been reported, see: a M. Nyerges, A. Arany, I. Fejes, P. W. Groundwater, W. Zhang, D. Bendell, R. J. Anderson, L. Töke, Tetrahedron 2002, 58, 989-995;
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There are no examples for the stereoselective preparation of 5,6-disubstituted piperazinones, and only two examples of the preparation of a racemate and mixture of diastereomers have been reported, see: a) M. Nyerges, A. Arany, I. Fejes, P. W. Groundwater, W. Zhang, D. Bendell, R. J. Anderson, L. Töke, Tetrahedron 2002, 58, 989-995;
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13
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53849131257
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14
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53849095948
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NOE data are described in the Supporting Information Figure Sl
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NOE data are described in the Supporting Information (Figure Sl).
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23
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53849100270
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1H NMR spectroscopy; see the Supporting Information. (Figures S2 and S3)
-
1H NMR spectroscopy; see the Supporting Information. (Figures S2 and S3)
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-
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24
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0037123432
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a) C. Xiong, W. Wang, V. J. Hruby, J. Org. Chem. 2002, 67, 3514-3517;
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26
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53849087447
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See Figure S4 in the Supporting Information.
-
See Figure S4 in the Supporting Information.
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27
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3543035211
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28
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53849121889
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The stereochemistry of the anti-diol unit was checked by NOE observation of compound 38; see the Supporting Information. (Figure S5)
-
The stereochemistry of the anti-diol unit was checked by NOE observation of compound 38; see the Supporting Information. (Figure S5)
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-
-
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29
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53849118061
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1H NMR spectroscopy.
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1H NMR spectroscopy.
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30
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0000355339
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J. A. Marshall, B. G. Shearer, S. L. Crooks, J. Org. Chem. 1987, 52, 1236-1245.
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32
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53849107092
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The stereochemistry of the newly introduced hydroxy group was checked by mean of the modified Mosher's method; see the Supporting Information, Scheme Sl
-
The stereochemistry of the newly introduced hydroxy group was checked by mean of the modified Mosher's method; see the Supporting Information. (Scheme Sl)
-
-
-
-
36
-
-
53849131607
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-
The stereochemistry of the syn-diol unit was checked by NOE observation of a derivative from 42; see the Supporting Information. (Scheme S2)
-
The stereochemistry of the syn-diol unit was checked by NOE observation of a derivative from 42; see the Supporting Information. (Scheme S2)
-
-
-
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37
-
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53849122234
-
-
The azidolysis of Ns-aziridine in the real system gave the α-azido adduct with exceptional regioselectivity (> 20:1 =α/β-N 3) due to the steric hindrance of the isopropylidene acetal the model system gave 3.7:1 =α/β-N3
-
3).
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-
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38
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3242786409
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53849095947
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40
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0028361429
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Drake, B.1
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Lehl, M.3
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