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0345116797
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note
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6.
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24
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0345116796
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note
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An acetonide group was cleaved under the reported chlorination conditions.
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25
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84943048401
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Inhoffen, H. H.; Quinkert, G.; Schuetz, S.; Friedrich, G.; Tober, E. Chem. Ber. 1958, 91, 781; Lythgoe, B.; Roberts, D. A.; Waterhouse, I. J. Chem. Soc., Perkin Trans. I 1977, 2608.
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37049100221
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Inhoffen, H. H.; Quinkert, G.; Schuetz, S.; Friedrich, G.; Tober, E. Chem. Ber. 1958, 91, 781; Lythgoe, B.; Roberts, D. A.; Waterhouse, I. J. Chem. Soc., Perkin Trans. I 1977, 2608.
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Lythgoe, B.1
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27
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0344685914
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note
-
Details of the preparation of 8 were presented in the Supporting Information.
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28
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0000996311
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Hu, Y.; Porco, J. A., Jr.; Labadie, J. W.; Gooding, O. W.; Trost, B. M. J. Org. Chem. 1998, 63, 4518.
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29
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0345548082
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note
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-1, whose bands completely disappeared after acid cleavage.
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30
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0344685913
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Ph.D. thesis, University of Tokyo, and ref 9
-
The alkylation by means of the chloride salt of the Grignard reagent instead of the bromide salt 6 was unsuccessful. There are few reports using an alkoxy Grignard reagent in the alkylation at the 22-position on the steroid system, see: Nakagawa, M. Ph.D. thesis, University of Tokyo, 1993 and ref 9.
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(1993)
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Nakagawa, M.1
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