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For the synthesis of hapalosin, see: (a) Dinh, T. Q.; Armstrong, R. W. J. Org. Chem. 1995, 60, 8118. (b) Ghosh, A. K.; Liu, W.; Xu, Y.; Chen, Z. Angew. Chem., Int. Ed. Engl. 1996, 35, 74. (c) Ohmori, K.; Okuno, T.; Nishiyama, S.; Yamamura, S. Tetrahedron Lett. 1996, 37, 3467. (d) Dinh, T. Q.; Du, X.; Armstrong, R. W. J. Org. Chem. 1996, 61, 6606. (e) Wagner, B.; Beugelmans, R.; Zhu, J. Tetrahedron Lett. 1996, 37, 6557. (f) Okuno, T.; Ohmori, K.; Nishiyama, S.; Yamamura, S.; Nakamura, K.; Houk, K. N.; Okamoto, K. Tetrahedron 1996, 52, 14723. Dinh, T. Q.; Smith, C. D.; Armstrong, R. W. J. Org. Chem. 1997, 62, 790.
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For the synthesis of hapalosin, see: (a) Dinh, T. Q.; Armstrong, R. W. J. Org. Chem. 1995, 60, 8118. (b) Ghosh, A. K.; Liu, W.; Xu, Y.; Chen, Z. Angew. Chem., Int. Ed. Engl. 1996, 35, 74. (c) Ohmori, K.; Okuno, T.; Nishiyama, S.; Yamamura, S. Tetrahedron Lett. 1996, 37, 3467. (d) Dinh, T. Q.; Du, X.; Armstrong, R. W. J. Org. Chem. 1996, 61, 6606. (e) Wagner, B.; Beugelmans, R.; Zhu, J. Tetrahedron Lett. 1996, 37, 6557. (f) Okuno, T.; Ohmori, K.; Nishiyama, S.; Yamamura, S.; Nakamura, K.; Houk, K. N.; Okamoto, K. Tetrahedron 1996, 52, 14723. Dinh, T. Q.; Smith, C. D.; Armstrong, R. W. J. Org. Chem. 1997, 62, 790.
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For the synthesis of hapalosin, see: (a) Dinh, T. Q.; Armstrong, R. W. J. Org. Chem. 1995, 60, 8118. (b) Ghosh, A. K.; Liu, W.; Xu, Y.; Chen, Z. Angew. Chem., Int. Ed. Engl. 1996, 35, 74. (c) Ohmori, K.; Okuno, T.; Nishiyama, S.; Yamamura, S. Tetrahedron Lett. 1996, 37, 3467. (d) Dinh, T. Q.; Du, X.; Armstrong, R. W. J. Org. Chem. 1996, 61, 6606. (e) Wagner, B.; Beugelmans, R.; Zhu, J. Tetrahedron Lett. 1996, 37, 6557. (f) Okuno, T.; Ohmori, K.; Nishiyama, S.; Yamamura, S.; Nakamura, K.; Houk, K. N.; Okamoto, K. Tetrahedron 1996, 52, 14723. Dinh, T. Q.; Smith, C. D.; Armstrong, R. W. J. Org. Chem. 1997, 62, 790.
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Ohmori, K.1
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For the synthesis of hapalosin, see: (a) Dinh, T. Q.; Armstrong, R. W. J. Org. Chem. 1995, 60, 8118. (b) Ghosh, A. K.; Liu, W.; Xu, Y.; Chen, Z. Angew. Chem., Int. Ed. Engl. 1996, 35, 74. (c) Ohmori, K.; Okuno, T.; Nishiyama, S.; Yamamura, S. Tetrahedron Lett. 1996, 37, 3467. (d) Dinh, T. Q.; Du, X.; Armstrong, R. W. J. Org. Chem. 1996, 61, 6606. (e) Wagner, B.; Beugelmans, R.; Zhu, J. Tetrahedron Lett. 1996, 37, 6557. (f) Okuno, T.; Ohmori, K.; Nishiyama, S.; Yamamura, S.; Nakamura, K.; Houk, K. N.; Okamoto, K. Tetrahedron 1996, 52, 14723. Dinh, T. Q.; Smith, C. D.; Armstrong, R. W. J. Org. Chem. 1997, 62, 790.
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Du, X.2
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13
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0030565527
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For the synthesis of hapalosin, see: (a) Dinh, T. Q.; Armstrong, R. W. J. Org. Chem. 1995, 60, 8118. (b) Ghosh, A. K.; Liu, W.; Xu, Y.; Chen, Z. Angew. Chem., Int. Ed. Engl. 1996, 35, 74. (c) Ohmori, K.; Okuno, T.; Nishiyama, S.; Yamamura, S. Tetrahedron Lett. 1996, 37, 3467. (d) Dinh, T. Q.; Du, X.; Armstrong, R. W. J. Org. Chem. 1996, 61, 6606. (e) Wagner, B.; Beugelmans, R.; Zhu, J. Tetrahedron Lett. 1996, 37, 6557. (f) Okuno, T.; Ohmori, K.; Nishiyama, S.; Yamamura, S.; Nakamura, K.; Houk, K. N.; Okamoto, K. Tetrahedron 1996, 52, 14723. Dinh, T. Q.; Smith, C. D.; Armstrong, R. W. J. Org. Chem. 1997, 62, 790.
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Beugelmans, R.2
Zhu, J.3
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14
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0030592790
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For the synthesis of hapalosin, see: (a) Dinh, T. Q.; Armstrong, R. W. J. Org. Chem. 1995, 60, 8118. (b) Ghosh, A. K.; Liu, W.; Xu, Y.; Chen, Z. Angew. Chem., Int. Ed. Engl. 1996, 35, 74. (c) Ohmori, K.; Okuno, T.; Nishiyama, S.; Yamamura, S. Tetrahedron Lett. 1996, 37, 3467. (d) Dinh, T. Q.; Du, X.; Armstrong, R. W. J. Org. Chem. 1996, 61, 6606. (e) Wagner, B.; Beugelmans, R.; Zhu, J. Tetrahedron Lett. 1996, 37, 6557. (f) Okuno, T.; Ohmori, K.; Nishiyama, S.; Yamamura, S.; Nakamura, K.; Houk, K. N.; Okamoto, K. Tetrahedron 1996, 52, 14723. Dinh, T. Q.; Smith, C. D.; Armstrong, R. W. J. Org. Chem. 1997, 62, 790.
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Nakamura, K.5
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Okamoto, K.7
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15
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0030951560
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For the synthesis of hapalosin, see: (a) Dinh, T. Q.; Armstrong, R. W. J. Org. Chem. 1995, 60, 8118. (b) Ghosh, A. K.; Liu, W.; Xu, Y.; Chen, Z. Angew. Chem., Int. Ed. Engl. 1996, 35, 74. (c) Ohmori, K.; Okuno, T.; Nishiyama, S.; Yamamura, S. Tetrahedron Lett. 1996, 37, 3467. (d) Dinh, T. Q.; Du, X.; Armstrong, R. W. J. Org. Chem. 1996, 61, 6606. (e) Wagner, B.; Beugelmans, R.; Zhu, J. Tetrahedron Lett. 1996, 37, 6557. (f) Okuno, T.; Ohmori, K.; Nishiyama, S.; Yamamura, S.; Nakamura, K.; Houk, K. N.; Okamoto, K. Tetrahedron 1996, 52, 14723. Dinh, T. Q.; Smith, C. D.; Armstrong, R. W. J. Org. Chem. 1997, 62, 790.
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9844234385
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note
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The synthesis and MDR-reversing property of the proline analogs were first described in a communication in this journal (ref 6).
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33845374534
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Jadhav, P. K.; Bhat, K. S.; Perumal, P. T.; Brown, H. C. J. Org. Chem. 1986, 51, 432.
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9844253448
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note
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3, and DIAD in THF was very slow and did not consume much of 13.
-
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26
-
-
9844226337
-
-
note
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3 is zero, its ee is > 95% since coupling of acid 24 and L-Val-OMe with BOP reagent quantitatively resulted in only one isomer of the amide product.
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27
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0000865359
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Lal, B.; Pramanik, B. N.; Manhas, M. S.; Bose, A. K. Tetrahedron Lett. 1977, 1977-80.
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9844231631
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-
note
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After the ester generated by the coupling of acid 24 with L-Val-OMe was hydrolyzed, the resulting acid could not be coupled with amino alcohol 25 via various methods, including BOP reagent and HATU, to make alcohol 27.
-
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31
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9844240042
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note
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1;H NMR of the crude product was inauspicious.
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32
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84986437005
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9844222057
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note
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Molecular modeling of the modulators in methanol was also desired. For Macromodel programs, the GB/SA solvation model is the best solvation model, but it is equipped with parameters only for chloroform or water.
-
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-
-
36
-
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9844259029
-
-
note
-
With or without distance constraints, the two secondary amide bonds of the triamide analog 2 are s-trans.
-
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-
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37
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9844226928
-
-
note
-
In ref 6, it was reported that computation employing distance constraints resulted in seven conformations for analog 5, all containing an s-cis amide bond. This is an error which stemmed from an incorrect proton being inputted in the distance constraints.
-
-
-
-
38
-
-
9844228031
-
-
note
-
1-N angle is 104°. Since the former angle is <90°, it does not meet the requirement of a hydrogen bond.
-
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39
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0029895437
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These cytotoxicity and drug accumulation assays have been employed to test the MDR-reversing activity of hapalosin (ref 3) and dendroamide A and welwitindolinone analogs, respectively: (a) Ogino, J.; Moore, R. E.; Patterson, G. M. L.; Smith, C. D. J. Nat. Prod. 1996, 59, 581. (b) Smith, C. D.; Zilfou, J. T.; Stratmann, K.; Patterson, G. M. L.; Moore, R. E. Mol. Pharm. 1995, 47, 241.
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These cytotoxicity and drug accumulation assays have been employed to test the MDR-reversing activity of hapalosin (ref 3) and dendroamide A and welwitindolinone analogs, respectively: (a) Ogino, J.; Moore, R. E.; Patterson, G. M. L.; Smith, C. D. J. Nat. Prod. 1996, 59, 581. (b) Smith, C. D.; Zilfou, J. T.; Stratmann, K.; Patterson, G. M. L.; Moore, R. E. Mol. Pharm. 1995, 47, 241.
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9844263510
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note
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The PMB ether of hapalosin has only marginal anti-MDR activity (ref 6).
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42
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0027857964
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