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85069129710
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note
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Trace amounts (<5%) of a mixture of (3R,4s)- and (3R,4R)-3-hydroxy-3-trimethylsilyl-hydroxy-4-phenyl-β-lactams were also formed.
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45
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33947468884
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Compound (1′R,2S,5R)-5 is formed through a Zimmermann-Traxler transition state with the hydrogen of the imine, rather than the phenyl substituent, over the face of the dioxolanone ring. The formation of (1′S,2S,5R)-4 as the major isomer may be due to the steric repulsion between the methyl substituent of the enolate of (2S,5S)-1a and the phenyl substituent of the imine 2. See: Zimmermann, H.; Traxler, M. J. Am. Chem. Soc. 1957, 79, 1920.
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46
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0001665760
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For a detailed description of these side products see: (a) Seebach, D.; Naef, R.; Calderari, G. Tetrahedron 1984, 40, 1313-1324; (b) see Ref. 12c.
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Seebach, D.1
Naef, R.2
Calderari, G.3
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47
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0001665760
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see Ref. 12c
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For a detailed description of these side products see: (a) Seebach, D.; Naef, R.; Calderari, G. Tetrahedron 1984, 40, 1313-1324; (b) see Ref. 12c.
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48
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85069133591
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note
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It is worth noting that the O-TMS protected β-lactam 15 can be easily transformed into the corresponding N-t-Boc-protected 2-methyl-phenylisoserine methyl ester via acylation at the nitrogen atom with di-tert-butyl dicarbonate followed by methanolysis. See Ref. 11.
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