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4344664123
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note
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13C NMR spectra. Their stereochemical assignment was established by Sardina et al. by the analysis of NOE effects and coupling constants of their cyclic urea derivatives.10a
-
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48
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4344562485
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Negishi, E., Ed.; Wiley-VCH: Weinheim, chapter VII.2
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The low stereoselectivity might be due to isomerization processes on the catalyst's surface promoted by the long reaction times: King, A. O.; Larsen, R. D. In Handbook of Organopalladium Chemistry for Organic Synthesis; Negishi, E., Ed.; Wiley-VCH: Weinheim, 1998; Vol. 2, chapter VII.2, pp 13-24. This assumption is supported by the isolation of isomerized starting material (entry 1).
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King, A.O.1
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4344652340
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note
-
Because of the symmetry of starting material (Z)-3 syn addition of dihydrogen (as known from the model systems) at both sides of the double bond furnishes the same nonracemic diastereomer (anti)-4.
-
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51
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1542357346
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(b) Clarke, P. A.; Martin, W. H. C. Annu. Rep. Prog. Chem., Sect. B 2003, 99, 84-103.
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0035874717
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Several methods are known for deprotection of tert-butyl esters in the presence of Boc groups22a,b and vice versa.22c Selective cleavage of Cbz-protection is achievable via Pd-catalyzed hydrogenation; however, homogeneous hydrogenation leaves the Cbz group untouched.22d (a) Marcantoni, E.; Massaccesi, M.; Torregiani, E.; Bartoli, G.; Bosco, M.; Sambri, L. J. Org. Chem. 2001, 66, 4430-4432.
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4344671406
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note
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For a general procedure for peptide dimerization see Supporting Information and ref 11.
-
-
-
-
57
-
-
4344589113
-
-
note
-
After reaching an approximately 1:1 ratio of Z- and E-isomers, the reaction is terminated; non-converted Z-starting material can be recovered and reused.
-
-
-
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