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0141624072
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(b) For a semi-synthesis of 1, see: Mikolajczak, K. L.; Smith, C. R., Jr.; Weisleder, D.; Kelly, T. R.; McKenna, J. C.; Christenson, P. A. Tetrahedron Lett. 1974, 15, 283-286.
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19
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33747615147
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note
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Deoxyharringtonine (1) is isolated in <0.01% yield of the plant dry weight.
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22
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0011489482
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Tanida, H.; Okada, T.; Kotera, K. Bull. Chem. Soc. Jpn. 1973, 46, 934-938.
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Tanida, H.1
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23
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33747591119
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note
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A stepwise pathway, involving formation of a cationic p-quinone methide and subsequent 7-exo cyclization, cannot be discounted.
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24
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0025228628
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Ali, S. M.; Ramesh, K.; Borchardt, R. T. Tetrahedron Lett. 1990, 31, 1509-1512.
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Ali, S.M.1
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Borchardt, R.T.3
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25
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33747618849
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note
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Convergence of both diastereomers of 11 to form 12 may arise from either direct [3,3]-rearrangement of both diastereomers, benzylic epimerization of 11 prior to [3,3]-rearrangement, or a stepwise mechanism (see ref 7).
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26
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0036263857
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Epperson, M. T.; Gin, D. Y. Angew. Chem., Int. Ed. 2002, 41, 1778-1780.
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Epperson, M.T.1
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28
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33747607394
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note
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β-Approach of the dipolarophile in the cycloaddition followed by C5 epimerization via transannular rupture and reclosure (ref 2g) to form 15 cannot be discounted.
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29
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0025907419
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Kunzer, H.; Stahnke, M.; Sauer, G.; Wiechert, R. Tetrahedron Lett. 1991, 32, 1949-1952.
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Clarke, P.A.1
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31
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33747610302
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note
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For an acylation of 2 in the semi-synthesis of harringtonine, see ref 3c.
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34
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0001647522
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