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0342351477
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Friedel pair reflections and anomalous scatterings were used to determine the absolute configuration
-
Friedel pair reflections and anomalous scatterings were used to determine the absolute configuration.
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23
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33845281396
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A similar reversal of selectivities between ozone and m-CPBA has been reported previously, see: Aggarwal, V. K.; Davies, I. W.; Franklin, R.; Maddock, J.; Mahon, M. F.; Molloy, K. C. J. Chem. Soc., Perkin Trans. 1 1994, 2363-2368.
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Kagan, H.B.1
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33751386816
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A similar amplification of ee in the asymmetric oxidation of sulfides has been reported previously, see: Komatsu, N.; Hashizume, M.; Sugita, T.; Uemura, S. J. Org. Chem. 1993, 58, 4529-4533. Aggarwal, V. K.; Esquivel-Zamora, B. N.; Evans, G. R.; Jones, E. J. Org. Chem. 1998, 63, 7306-7310.
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Komatsu, N.1
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-
38
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0000308238
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-
A similar amplification of ee in the asymmetric oxidation of sulfides has been reported previously, see: Komatsu, N.; Hashizume, M.; Sugita, T.; Uemura, S. J. Org. Chem. 1993, 58, 4529-4533. Aggarwal, V. K.; Esquivel-Zamora, B. N.; Evans, G. R.; Jones, E. J. Org. Chem. 1998, 63, 7306-7310.
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Aggarwal, V.K.1
Esquivel-Zamora, B.N.2
Evans, G.R.3
Jones, E.4
-
40
-
-
0342351468
-
-
The reaction should be carried out below 5°C to avoid partial racemization of 1
-
The reaction should be carried out below 5°C to avoid partial racemization of 1.
-
-
-
-
41
-
-
0343220922
-
-
In the absence of crown ether, the acetate 8a-Ac was formed in a poor yield (56%) and a considerable amount of acetal 7a was recovered (28%)
-
In the absence of crown ether, the acetate 8a-Ac was formed in a poor yield (56%) and a considerable amount of acetal 7a was recovered (28%).
-
-
-
-
42
-
-
0342351467
-
-
note
-
4Cl aqueous solution. This workup was essential to prevent undesirable recyclization of the product. The partially acetylated product was filtrated through a short pad of silica gel and then completely acetylated with acetic anhydride and DMAP.
-
-
-
-
43
-
-
0010640653
-
-
The absolute configurations of the benzyl ethers 8a-Bn, 8c, and 8e-f were established by Mosher's method after removal of the chiral auxiliary with 10% HCl followed by conversion into the MTPA esters. Those of the acetates 8a-Ac and 8b were determined by Mosher's method after converting the alkoxides from 7a and 7b into the corresponding MTPA esters. The stereochemistry of 8d was assumed by analogy with others: Dale, J. A.; Mosher, H. S. J. Org. Chem. 1969, 34, 2543-2549; J. Am. Chem. Soc. 1973, 95, 512-519.
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, vol.34
, pp. 2543-2549
-
-
Dale, J.A.1
Mosher, H.S.2
-
44
-
-
33947085552
-
-
The absolute configurations of the benzyl ethers 8a-Bn, 8c, and 8e-f were established by Mosher's method after removal of the chiral auxiliary with 10% HCl followed by conversion into the MTPA esters. Those of the acetates 8a-Ac and 8b were determined by Mosher's method after converting the alkoxides from 7a and 7b into the corresponding MTPA esters. The stereochemistry of 8d was assumed by analogy with others: Dale, J. A.; Mosher, H. S. J. Org. Chem. 1969, 34, 2543-2549; J. Am. Chem. Soc. 1973, 95, 512-519.
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, vol.95
, pp. 512-519
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-
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