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0021775497
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In this reaction, it should be noted that we can avoid matched-mismatched problems when R has stererogenic centers (Scheme 1), because asymmetric induction is carried out at the remote position where the effect of R group becomes negligible. In fact, synthesis of the diastereomer 23 was also achieved with Soai protocol simply employing (R)-DPMPM to furnish 23 with 93:7 diastereoselecctivity. Further transformation of 23 using similar procedures in Scheme 2 afforded the allyl carbamate 24 in good yield (Scheme 4). For the matched-mismatched problems, see the reference: Masamune, S.; Choy, W.; Peterson, J. S.; Sita, L. R. Angew. Chem., Int. Ed. Engl. 1984, 24, 1.
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25
-
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0038251473
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-
note
-
The minor isomer produced in the step (8 → 9) was removed at this stage by recrystallisation of 14.
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26
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0029119899
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33746236970
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(a) Schwab, P.; France, M. B.; Ziller, J. W.; Grubbs, R. H. Angew. Chem., Int. Ed. Engl. 1995, 2039.
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29
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0037913959
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note
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3): δ = 22.8, 23.8, 27.4, 52.4, 60.1, 68.3, 75.5, 82.8.
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