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1
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Cephalostatin Synthesis. 15. Portions of this work have been communicated in Articles 6 and 9 of this series: Jeong, J. U.; Fuchs, P. L. Tetrahedron Lett. 1995, 36, 2431. Jeong, J. U.; Sutton, S. C.; Kim, S.; Fuchs, P. L. J. Am. Chem. Soc. 1995, 117, 10157. For additional syntheses of cephalostatin-related pyrazines, see: (a) Pan, Y.; Merriman, R. L.; Tanzer, L. R.; Fuchs, P. L. Bioorg. Med. Chem. Lett. 1992, 2, 967. (b) Heathcock, C. H.; Smith, S. C. J. Org. Chem. 1994, 59, 6828. (c) Kramer, A.; Ullmann, U.; Winterfeldt, E. J. Chem. Soc., Perkin Trans. 1 1993, 2865. (d) Ganesan, A. Angew. Chem., Int. Ed. Engl. 1996, 35, 611. (e) Drogemuller, M.; Jantelat, R.; Winterfelt, E. Angew. Chem., Int. Ed. Engl. 1996, 35, 1572. (f) Guo, C.; Bhandaru, S.; Fuchs, P. L.; Boyd, M. R. J. Am. Chem. Soc. 1996, 118, 10672. (g) LaCour, T. G.; Guo, C.; Bhandaru, S.; Boyd, M. R.; Fuchs, P. L. J. Am. Chem. Soc. 1998, 120, 692. (h) Drögemüller, M.; Flessner, T.; Jaulelat, R.; Scholz, U.; Winterfeldt, E. Eur. J. Org. Chem. 1998, 2811.
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Cephalostatin Synthesis. 15. Portions of this work have been communicated in Articles 6 and 9 of this series: Jeong, J. U.; Fuchs, P. L. Tetrahedron Lett. 1995, 36, 2431. Jeong, J. U.; Sutton, S. C.; Kim, S.; Fuchs, P. L. J. Am. Chem. Soc. 1995, 117, 10157. For additional syntheses of cephalostatin-related pyrazines, see: (a) Pan, Y.; Merriman, R. L.; Tanzer, L. R.; Fuchs, P. L. Bioorg. Med. Chem. Lett. 1992, 2, 967. (b) Heathcock, C. H.; Smith, S. C. J. Org. Chem. 1994, 59, 6828. (c) Kramer, A.; Ullmann, U.; Winterfeldt, E. J. Chem. Soc., Perkin Trans. 1 1993, 2865. (d) Ganesan, A. Angew. Chem., Int. Ed. Engl. 1996, 35, 611. (e) Drogemuller, M.; Jantelat, R.; Winterfelt, E. Angew. Chem., Int. Ed. Engl. 1996, 35, 1572. (f) Guo, C.; Bhandaru, S.; Fuchs, P. L.; Boyd, M. R. J. Am. Chem. Soc. 1996, 118, 10672. (g) LaCour, T. G.; Guo, C.; Bhandaru, S.; Boyd, M. R.; Fuchs, P. L. J. Am. Chem. Soc. 1998, 120, 692. (h) Drögemüller, M.; Flessner, T.; Jaulelat, R.; Scholz, U.; Winterfeldt, E. Eur. J. Org. Chem. 1998, 2811.
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20
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13044310489
-
-
note
-
More than 15 g of alcohol 4, the Stanyl allylation product from the pentacyclic aldehyde 2, was accumulated during synthesis of the North unit. For detail, see preceding paper.
-
-
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23
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33751385752
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29
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0026758525
-
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2O at reflux to provide 1,2-diol 29, which was converted to acetonide 30. Cleavage of the benzyl ether of 30 by hydrogenation followed by Swern oxidation of the resultant alcohol 31 provided aldehyde 32. Aldehyde 32 was converted to oxime 33, which was oxidized to the desired nitroacetonide 34 by using Petrini's protocol (see: Ballini, R.; Marcamoni, E.; Petrini, M. Tetrahedron Lett. 1992, 4835). For experimental procedure, see Supporting Information.
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30
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0027255156
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34
-
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13044261824
-
-
note
-
Commercially available glycidol 52 was protected as MOM ether 53, followed by epoxide opening to give phenyl sulfide 54 (2 steps, 70%) and oxone oxidation to afford sulfone 56 (90%). In our initial attempt, oxidation of the hydroxyl in 56 was found to be problematic. For experimental procedure, see Supporting Information.
-
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35
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0000295212
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(a) Frigerio, M.; Santagostino, M.; Sputore, S.; Palmisano, G. J. Org. Chem. 1995, 60, 7272.
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Plenum Press, 5.5
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44
-
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13044315632
-
-
note
-
X-ray structural information relating to compounds 76, S-75, and R-75 can be obtained from the Cambridge Crystallographic Data Centre.
-
-
-
-
45
-
-
13044309171
-
-
note
-
Calculations were performed using a Tektronix CAChe v3.5. For additional examples of using molecular mechanics for prediction of spiroketal thermodynamics, see ref 8.
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46
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0000959628
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Brown, H. C.; Garg, C. P.; Liu, K.-T. J. Org. Chem. 1971, 36, 387.
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(1971)
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Brown, H.C.1
Garg, C.P.2
Liu, K.-T.3
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48
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0001491677
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Williams, D. R.; Klingler, F. D.; Dabral, V. Tetrahedron Lett. 1988, 29, 3415.
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(1988)
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Williams, D.R.1
Klingler, F.D.2
Dabral, V.3
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49
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13044298929
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MM2 calculation was performed using CAChe v.3.7
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MM2 calculation was performed using CAChe v.3.7.
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51
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13044302336
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note
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20 methine proton was believed to be the slowest step in the proposed mechanism.
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52
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0027310691
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(a) Li, C.; Arasappan, A.; Fuchs, P. L. Tetrahedron Lett. 1993, 34, 3535.
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Li, C.1
Arasappan, A.2
Fuchs, P.L.3
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53
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0028294601
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(b) Li, C.; Shih, T.-L.; Jeong, J. U.; Arasappan, A.; Fuchs, P. L. Tetrahedron Lett. 1994, 35, 2645.
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(1994)
Tetrahedron Lett.
, vol.35
, pp. 2645
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Li, C.1
Shih, T.-L.2
Jeong, J.U.3
Arasappan, A.4
Fuchs, P.L.5
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54
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0001211063
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Suzuki, H.; Kawaguchi, T.; Takaoka, K. Bull. Chem. Soc. Jpn. 1986, 59, 665.
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(1986)
Bull. Chem. Soc. Jpn.
, vol.59
, pp. 665
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Suzuki, H.1
Kawaguchi, T.2
Takaoka, K.3
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55
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13044301501
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note
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We are extremely grateful to Professor G. R. Pettit and Dr. Jun-Ping Xu of Arizona State for comparisons of synthetic cephalostatins 7 (10) and 12 (9) with the natural materials.
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