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For the synthetic work on the marine natural product halichondrins from this laboratory, see: (a) Aicher, T. D.; Buszek, K. R.; Fang, F. G.: Forsvth, C. J.; Jung, S. H.: Kishi, Y.: Matelich, M. C.; Scola, P. M.: Spero, D. M.; Yoon, S. K. J. Am. Chem. Soc. 1992. 114. 3162.
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(a) Zheng, W.: Seletsky, B. M.: Palme, M. H.: Lydon. P. J.; Singer, L. A.: Chase. C. E.; Lemelin, C. A.: Shen, Y.; Davis, H.; Tremblay, L.: Towle, M. J.; Salvato. K. A.; Weis, B. F.; Aalfs, K. K.; Kishi, Y.; Littlefield, B. A.; Yu, M. Bioorg. Med. Chem. Lett. 2004, 14, 5551.
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70349929422
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U.S. Patents 6214865, 6365759, and International Patent W099/65894.
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(b) Littlefield, B. A.: Palme, M. H.: Seletsky, B. M.: Towle, M. J.; Yu, M. J.; Zheng. W. U.S. Patents 6214865, 6365759, and International Patent W099/65894.
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Littlefield, B.A.1
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(c) Yu, M. J.; Kishi, Y.; Littlefield, B. A. In Anticancer Agents from Natural Products; Cragg, G. M., Kingston, D. G. I., Newman, D. J., Eds.; CRC Press: Boca Raton, FL, 2005: pp 241-265.
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70349914110
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E7389 website
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(d) E7389 website: http:// www.dmgs.com/nda/e7389-080201.html.
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29
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70349906681
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One of the research focuses has been the development and application of catalytic asymmetric Cr-mediated coupling reactions. Recent results on this subject will be reported in separate papers.
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One of the research focuses has been the development and application of catalytic asymmetric Cr-mediated coupling reactions. Recent results on this subject will be reported in separate papers.
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31
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70349904638
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2PYR.
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2PYR.
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32
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0000458209
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Matrero-Tellado, J.J.3
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38
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70349931566
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4/NMO (22% overall yield from 3).
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4/NMO (22% overall yield from 3).
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39
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70349902671
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In the new synthesis, the overall yield of 3 →13 was 45%, whereas that of 3 → the intermediate synthetically equivalent to 13 was 13% in the previous synthesis. The over three-time improvement in overall yield is primarily attributed to (1) higher overall yield from 3 to 11. (2) elimination of the benzylation (90%)/debenzylation (75%) steps, and (3) higher efficiency of the hydroxyl-directed reduction (vide infra).
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In the new synthesis, the overall yield of 3 →13 was 45%, whereas that of 3 → the intermediate synthetically equivalent to 13 was 13% in the previous synthesis. The over three-time improvement in overall yield is primarily attributed to (1) higher overall yield from 3 to 11. (2) elimination of the benzylation (90%)/debenzylation (75%) steps, and (3) higher efficiency of the hydroxyl-directed reduction (vide infra).
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40
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70349906661
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3 in the previous synthesis, whereas both (Z)- and (E)-α,βunsaturated phenylsulfones were smoothly reduced in the new synthesis (vide infra).
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3 in the previous synthesis, whereas both (Z)- and (E)-α,βunsaturated phenylsulfones were smoothly reduced in the new synthesis (vide infra).
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43
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0342306428
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Crabtree, R. H.: Felkin, H.: Fellebeen-Khan, T.: Morris, G. E. J. Organomet. Chem. 1979. 168, 183.
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Crabtree, R.H.1
Felkin, H.2
Fellebeen-Khan, T.3
Morris, G.E.J.4
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70349907861
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In the previous syntheses, we used 14 and 16 as the C27-C35 building block. However, our recent studies demonstrate that 13 is an ideal C27-C35 building block (ref 6).
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In the previous syntheses, we used 14 and 16 as the C27-C35 building block. However, our recent studies demonstrate that 13 is an ideal C27-C35 building block (ref 6).
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