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For recent advances in bioengineering approaches to the modular synthesis of polyketides, see: a) D. E. Cane, C. T. Walsh, C. Khosla, Science 1998, 282, 63; b) L. Katz, Chem. Rev. 1997, 97, 2557; c) C. Khosla, Chem. Rev. 1997, 97, 2577.
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For recent applications of convergent nitrile oxide cycloadditions, see: a) G. J. McGarvey, J. A. Mathys, K. J. Wilson, J., Org. Chem. 1996, 61, 5704; b) W. Zheng, J. A. DeMattei, J.-P. Wu, J. J.-W. Duan, L. R. Cook, H. Oinuma, Y. Kishi, J. Am. Chem. Soc. 1996, 118, 7946; c) J. W. Bode, E. M. Carreira, J. Am. Chem. Soc. 2001, 123, in press.
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For recent applications of convergent nitrile oxide cycloadditions, see: a) G. J. McGarvey, J. A. Mathys, K. J. Wilson, J., Org. Chem. 1996, 61, 5704; b) W. Zheng, J. A. DeMattei, J.-P. Wu, J. J.-W. Duan, L. R. Cook, H. Oinuma, Y. Kishi, J. Am. Chem. Soc. 1996, 118, 7946; c) J. W. Bode, E. M. Carreira, J. Am. Chem. Soc. 2001, 123, in press.
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0346601558
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For recent applications of convergent nitrile oxide cycloadditions, see: a) G. J. McGarvey, J. A. Mathys, K. J. Wilson, J., Org. Chem. 1996, 61, 5704; b) W. Zheng, J. A. DeMattei, J.-P. Wu, J. J.-W. Duan, L. R. Cook, H. Oinuma, Y. Kishi, J. Am. Chem. Soc. 1996, 118, 7946; c) J. W. Bode, E. M. Carreira, J. Am. Chem. Soc. 2001, 123, in press.
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a) Grignard additions: D. P. Curran, J. Zheng, J. Chem. Soc. Perkins Trans. 1 1991, 2613; b) alkylation: V. Jäger, R. Schohe, E. F. Paulus, Tetrahedron Lett. 1983, 24, 5501; c) A. P. Kozikowski, A. K. Ghosh, J. Am. Chem. Soc. 1982, 104, 5788; d) Aldol addition: D. P. Curran, J.-C. Chao, J. Am. Chem. Soc. 1987, 109, 3037; e) A. Kamimura, S. Manumo, Tetrahedron Lett. 1990, 31, 5053.
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a) Grignard additions: D. P. Curran, J. Zheng, J. Chem. Soc. Perkins Trans. 1 1991, 2613; b) alkylation: V. Jäger, R. Schohe, E. F. Paulus, Tetrahedron Lett. 1983, 24, 5501; c) A. P. Kozikowski, A. K. Ghosh, J. Am. Chem. Soc. 1982, 104, 5788; d) Aldol addition: D. P. Curran, J.-C. Chao, J. Am. Chem. Soc. 1987, 109, 3037; e) A. Kamimura, S. Manumo, Tetrahedron Lett. 1990, 31, 5053.
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a) Grignard additions: D. P. Curran, J. Zheng, J. Chem. Soc. Perkins Trans. 1 1991, 2613; b) alkylation: V. Jäger, R. Schohe, E. F. Paulus, Tetrahedron Lett. 1983, 24, 5501; c) A. P. Kozikowski, A. K. Ghosh, J. Am. Chem. Soc. 1982, 104, 5788; d) Aldol addition: D. P. Curran, J.-C. Chao, J. Am. Chem. Soc. 1987, 109, 3037; e) A. Kamimura, S. Manumo, Tetrahedron Lett. 1990, 31, 5053.
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2O) is used for the in situ preparation of the magnesium alkoxides
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2O) is used for the in situ preparation of the magnesium alkoxides.
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34
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0000871191
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The synthesis of the corresponding aldehydes have been reported: a) A. Gaucher, J. Ollivier, J. Marguerite, R. Paugam, J. Salaün, Can. J. Chem. 1994, 72, 1312; b) in contrast to the corresponding aldehydes, which are unstable towards decomposition, we have found the oximes to be stable and amenable to prolonged storage.
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35
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85037276124
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in contrast to the corresponding aldehydes, which are unstable towards decomposition, we have found the oximes to be stable and amenable to prolonged storage
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The synthesis of the corresponding aldehydes have been reported: a) A. Gaucher, J. Ollivier, J. Marguerite, R. Paugam, J. Salaün, Can. J. Chem. 1994, 72, 1312; b) in contrast to the corresponding aldehydes, which are unstable towards decomposition, we have found the oximes to be stable and amenable to prolonged storage.
-
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36
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0030883527
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a) Several preparations of chiral olefins 3 and 4 have been reported in both enantiomeric forms. For our purposes they were prepared from enantiomerically pure 2-hydroxy-3-pentene, itself prepared by the method of Noyori et al.: K. Matsumura, S. Hashiguchi, T. Ikariya, R. Noyori, J. Am. Chem. Soc. 1997, 119, 8738; b) for another procedure, see O. Hamed, P. M. Henry, Organometallics 1997, 16, 4903.
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a) Several preparations of chiral olefins 3 and 4 have been reported in both enantiomeric forms. For our purposes they were prepared from enantiomerically pure 2-hydroxy-3-pentene, itself prepared by the method of Noyori et al.: K. Matsumura, S. Hashiguchi, T. Ikariya, R. Noyori, J. Am. Chem. Soc. 1997, 119, 8738; b) for another procedure, see O. Hamed, P. M. Henry, Organometallics 1997, 16, 4903.
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85037273904
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In all cases the resulting cycloadducts are formed syn to the existing hydroxy group. Although Kanemasa et al. have established that the cycloaddition typically proceeds in > 99:1 syn:anti diastereomer ratio, we have confirmed this sense of induction by X-ray diffraction analysis of a derivative of 6 and by a synthetic application of 12 (see ref. [11c])
-
In all cases the resulting cycloadducts are formed syn to the existing hydroxy group. Although Kanemasa et al. have established that the cycloaddition typically proceeds in > 99:1 syn:anti diastereomer ratio, we have confirmed this sense of induction by X-ray diffraction analysis of a derivative of 6 and by a synthetic application of 12 (see ref. [11c]).
-
-
-
-
39
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85037280219
-
-
The use of the readily available enantiomers of allylic alcohols 3 and 4 provides a direct entry to the enantiomeric polypropionate building blocks
-
The use of the readily available enantiomers of allylic alcohols 3 and 4 provides a direct entry to the enantiomeric polypropionate building blocks.
-
-
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40
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33746591212
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For efforts towards iterative, solid-phase aldol approaches to polypropionates see: a) I. Paterson, J. P. Scott, J. Chem. Soc. Perkin Trans. 1 1999, 1003; b) I. Paterson, M. Donghi, K. Gerlach, Angew. Chem. 2000, 112, 3453; Angew. Chem. Int. Ed. 2000, 39, 3315.
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Paterson, I.1
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For efforts towards iterative, solid-phase aldol approaches to polypropionates see: a) I. Paterson, J. P. Scott, J. Chem. Soc. Perkin Trans. 1 1999, 1003; b) I. Paterson, M. Donghi, K. Gerlach, Angew. Chem. 2000, 112, 3453; Angew. Chem. Int. Ed. 2000, 39, 3315.
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For efforts towards iterative, solid-phase aldol approaches to polypropionates see: a) I. Paterson, J. P. Scott, J. Chem. Soc. Perkin Trans. 1 1999, 1003; b) I. Paterson, M. Donghi, K. Gerlach, Angew. Chem. 2000, 112, 3453; Angew. Chem. Int. Ed. 2000, 39, 3315.
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The synthesis of related isoxazolines by enzymatic resolution on a solid support has been reported, see: J. A. López-Pelegrín, P. Wentworth, F. Sieber, W. A. Metz, K. D. Janda, J. Org. Chem. 2000, 65, 8527.
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We speculate that the supposed tendency for alkyne-derived nitrile oxides to undergo dimerization or polymerization has precluded their prior use
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a) We speculate that the supposed tendency for alkyne-derived nitrile oxides to undergo dimerization or polymerization has precluded their prior use. b) Although oxime 13 is a readily prepared, known compound (L. P. Safronova, A. S. Medvedeva, N. S. Vyazankin, J. Gen. Chem. USSR Engl. Transl. 1983, 53, 1177) it is unstable towards prolonged storage.
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45
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72949096513
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it is unstable towards prolonged storage
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a) We speculate that the supposed tendency for alkyne-derived nitrile oxides to undergo dimerization or polymerization has precluded their prior use. b) Although oxime 13 is a readily prepared, known compound (L. P. Safronova, A. S. Medvedeva, N. S. Vyazankin, J. Gen. Chem. USSR Engl. Transl. 1983, 53, 1177) it is unstable towards prolonged storage.
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(1983)
J. Gen. Chem. USSR Engl. Transl.
, vol.53
, pp. 1177
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Safronova, L.P.1
Medvedeva, A.S.2
Vyazankin, N.S.3
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47
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0000988021
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b) D. P. Curran, S. A. Scanga, C. J. Fenk, J. Org. Chem. 1984, 49, 3474.
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(1984)
J. Org. Chem.
, vol.49
, pp. 3474
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Curran, D.P.1
Scanga, S.A.2
Fenk, C.J.3
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48
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0000430226
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For recent examples, see: at I. Paterson, G. J. Florence, K. Gerlach, J. P. Scott, Angew. Chem. 2000, 112, 385; Angew. Chem. Int. Ed. 2000, 39, 277;
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(2000)
Angew. Chem.
, vol.112
, pp. 385
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Paterson, I.1
Florence, G.J.2
Gerlach, K.3
Scott, J.P.4
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49
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85037279930
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For recent examples, see: at I. Paterson, G. J. Florence, K. Gerlach, J. P. Scott, Angew. Chem. 2000, 112, 385; Angew. Chem. Int. Ed. 2000, 39, 277;
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(2000)
Angew. Chem. Int. Ed.
, vol.39
, pp. 277
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50
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0342864427
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b) K. Tatsuda, Y. Koguchi, M. Kase, Bull. Chem. Soc. Jpn. 1988, 61, 2525;
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(1988)
Bull. Chem. Soc. Jpn.
, vol.61
, pp. 2525
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Tatsuda, K.1
Koguchi, Y.2
Kase, M.3
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51
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0033516536
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c) C. Esteve, M. Ferreró, P. Romea, F. Urpí, J. Vilarrasa, Tetrahedron Lett. 1999, 40, 5083.
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(1999)
Tetrahedron Lett.
, vol.40
, pp. 5083
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Esteve, C.1
Ferreró, M.2
Romea, P.3
Urpí, F.4
Vilarrasa, J.5
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52
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85037275226
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Iodide 17 was prepared by oxidation of 6 followed by Wittig olefination, deprotection, and iodide formation in 65% overall yield. Ketone 18 was prepared by oxidation of 5 in 91 % yield
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Iodide 17 was prepared by oxidation of 6 followed by Wittig olefination, deprotection, and iodide formation in 65% overall yield. Ketone 18 was prepared by oxidation of 5 in 91 % yield.
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