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Volumn 40, Issue 11, 2001, Pages 2082-2085

A General Solution to the Modular Synthesis of Polyketide Building Blocks by Kanemasa Hydroxy-Directed Nitrile Oxide Cycloadditions

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EID: 0001386311     PISSN: 14337851     EISSN: None     Source Type: Journal    
DOI: 10.1002/1521-3773(20010601)40:11<2082::AID-ANIE2082>3.0.CO;2-1     Document Type: Article
Times cited : (144)

References (52)
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    • 2O) is used for the in situ preparation of the magnesium alkoxides
    • 2O) is used for the in situ preparation of the magnesium alkoxides.
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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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    • in contrast to the corresponding aldehydes, which are unstable towards decomposition, we have found the oximes to be stable and amenable to prolonged storage
    • 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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    • 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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    • 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]).
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    • 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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    • 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    Scott, J.P.2
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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    Donghi, M.2    Gerlach, K.3
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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.
    • (2000) Angew. Chem. Int. Ed. , vol.39 , pp. 3315
  • 44
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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
    • 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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    • it is unstable towards prolonged storage
    • 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.
    • (1983) J. Gen. Chem. USSR Engl. Transl. , vol.53 , pp. 1177
    • Safronova, L.P.1    Medvedeva, A.S.2    Vyazankin, N.S.3
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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;
    • (2000) Angew. Chem. Int. Ed. , vol.39 , pp. 277
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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
    • 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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