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note
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The (2S,4R,5S) configuration was assigned to the product 3n obtained by oxidizing (2S,4R,5S)-2n with oxaziridines 1a,b as no NOE was observed in this diastereoisomer between the methyl on C-4 and the methylene and aromatic protons of the benzylamido residue. This observation suggested that the two groups are trans. In order to confirm this assignment, (2S,4R,5S)-2n was oxidized with MCPBA. This reagent is known to perform the oxidative desulfurization reaction with retention of chirality on 2-(methylthio)-1,3,2-oxazaphospholidine 2-sulfides (ref 10a), phosphonamidothioates (ref 10b), phosphinothioates (ref 10c), and phosphorothioates (ref 10d) and in fact a different 1,3,2-oxazaphospholidine 2-oxide 3n was formed which showed positive NOE effects between the above described residues (see the Experimental Section). These residues were thus in a cis relationship, and the (2A,4R,5S) configuration could be assigned unequivocally to this product.
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3: (r) Skowronska, A.; Krawczyk, E. Synthesis 1983, 509. Trifluoroacetic anhydride: (s) Helinski, J; Skrzypczynski, Z.; Wasiak, J.; Michalski, J. Tetrahedron Lett. 1990, 31, 4081.
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3: (r) Skowronska, A.; Krawczyk, E. Synthesis 1983, 509. Trifluoroacetic anhydride: (s) Helinski, J; Skrzypczynski, Z.; Wasiak, J.; Michalski, J. Tetrahedron Lett. 1990, 31, 4081.
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3: (r) Skowronska, A.; Krawczyk, E. Synthesis 1983, 509. Trifluoroacetic anhydride: (s) Helinski, J; Skrzypczynski, Z.; Wasiak, J.; Michalski, J. Tetrahedron Lett. 1990, 31, 4081.
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3: (r) Skowronska, A.; Krawczyk, E. Synthesis 1983, 509. Trifluoroacetic anhydride: (s) Helinski, J; Skrzypczynski, Z.; Wasiak, J.; Michalski, J. Tetrahedron Lett. 1990, 31, 4081.
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3: (r) Skowronska, A.; Krawczyk, E. Synthesis 1983, 509. Trifluoroacetic anhydride: (s) Helinski, J; Skrzypczynski, Z.; Wasiak, J.; Michalski, J. Tetrahedron Lett. 1990, 31, 4081.
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0002007485
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3: (r) Skowronska, A.; Krawczyk, E. Synthesis 1983, 509. Trifluoroacetic anhydride: (s) Helinski, J; Skrzypczynski, Z.; Wasiak, J.; Michalski, J. Tetrahedron Lett. 1990, 31, 4081.
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2SeO
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3: (r) Skowronska, A.; Krawczyk, E. Synthesis 1983, 509. Trifluoroacetic anhydride: (s) Helinski, J; Skrzypczynski, Z.; Wasiak, J.; Michalski, J. Tetrahedron Lett. 1990, 31, 4081.
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0005463907
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3
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3: (r) Skowronska, A.; Krawczyk, E. Synthesis 1983, 509. Trifluoroacetic anhydride: (s) Helinski, J; Skrzypczynski, Z.; Wasiak, J.; Michalski, J. Tetrahedron Lett. 1990, 31, 4081.
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0001313417
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2
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3: (r) Skowronska, A.; Krawczyk, E. Synthesis 1983, 509. Trifluoroacetic anhydride: (s) Helinski, J; Skrzypczynski, Z.; Wasiak, J.; Michalski, J. Tetrahedron Lett. 1990, 31, 4081.
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0025300510
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Dimethyldioxirane
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3: (r) Skowronska, A.; Krawczyk, E. Synthesis 1983, 509. Trifluoroacetic anhydride: (s) Helinski, J; Skrzypczynski, Z.; Wasiak, J.; Michalski, J. Tetrahedron Lett. 1990, 31, 4081.
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0001306333
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4
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3: (r) Skowronska, A.; Krawczyk, E. Synthesis 1983, 509. Trifluoroacetic anhydride: (s) Helinski, J; Skrzypczynski, Z.; Wasiak, J.; Michalski, J. Tetrahedron Lett. 1990, 31, 4081.
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3
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3: (r) Skowronska, A.; Krawczyk, E. Synthesis 1983, 509. Trifluoroacetic anhydride: (s) Helinski, J; Skrzypczynski, Z.; Wasiak, J.; Michalski, J. Tetrahedron Lett. 1990, 31, 4081.
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Styrene oxide and chloral: (o)
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3
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