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Inversion of an amide bond in a peptide chain is one of the earliest amide modifications introduced in peptides in order to improve their pharmacological properties, see: M. Goodman, and M. Chorev Acc. Chem. Res. 12 1979 1 7
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21
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11144271321
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note
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13C NMR, IR, MS) data (for compounds 11 and 12, see Ref. 17)
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25
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0037981212
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-
note
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Interestingly, when trichloroacetimidate 4 was subjected without any purification to the Overman rearrangement conditions, the allylic chloride 13 was isolated as sole product in 50% yield instead of the expected trichloroacetamide 4. Remarkably, the reaction took place in a total stereoselective way, affording exclusively the 3β-chloro diastereoisomer; its configuration was firmly established on the basis of NOESY experiments and the X-ray crystal structure of a p-nitrobenzoyl derivative. As other allylic chlorides [Jeganmohan, M.; Shanmugasundaram, M.; Cheng, C. Org. Lett. 2003, 5, 881-884], compound 13 can be a valuable synthetic intermediate. In addition, this compound has proved useful for the synthesis of halogenated sugars and peptide-carbohydrate hybrids, [Montero, A.; Benito, E.; Herradón, B., in preparation]
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26
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0026447771
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For synthetic applications of related compounds, see: K. Takeda, E. Kaji, Y. Konda, N. Sato, H. Nakamura, N. Miya, A. Morizane, Y. Yanagisawa, A. Akiyama, S. Zen, and Y. Harigaya Tetrahedron Lett. 33 1992 7145 7148
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Harigaya, Y.11
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0038262700
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N.M.A.J. Kriek, E. van der Hout, P. Kelly, K.E. van Meijgaarden, A. Geluk, T.H.M. Ottenhoff, G.A. van der Marel, M. Overhand, J.H. van Boom, A.R.P.M. Valentijn, and H.S. Overkleeft Eur. J. Org. Chem. 22 2003 2418 2427
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Overkleeft, H.S.11
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11144332864
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note
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3
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37
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2142827076
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I. Alves, S. Cowell, Y.S. Lee, X. Tang, P. Davis, F. Porreca, and V.J. Hruby Biochem. Biophys. Res. Commun. 318 2004 335 340
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Hruby, V.J.7
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40
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11144292629
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note
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The analytical and spectroscopic data for 11 and 12 are indicated below. To identify the signal assignations (that have been done by a combination of mono- and bi-dimensional NMR experiments), we have numbered the atoms in the following manner: unprimed number refer to the pyrane ring and the dipeptide fragment (including the side chains of the amino acids), starting from the pyranosidic oxygen; the primed number (′) indicate the carbon and hydrogen atoms in the allyloxy fragment; and the double-primed (″) numbers denote atoms in the tyrosine derivative fragment (including the side chain).
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41
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11144281751
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note
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Other peptide-scaffold hybrids (with other scaffolds than carbohydrate) with sequence similarities to enkephalins are also calpain inhibitors (Montero, A. Ph.D. thesis, Autónoma University, Madrid, July 2004)
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