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Both (S,S)- and (R,R)-N-methyl pseudoephedrine are commercially available and also can be easily prepared by N-methylation of pseudoephedrine with formaldehyde and formic acid.
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Both (S,S)- and (R,R)-N-methyl pseudoephedrine are commercially available and also can be easily prepared by N-methylation of pseudoephedrine with formaldehyde and formic acid.
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5
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33645870720
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For reviews on dynamic thermodynamic resolution, see: (a) Kim, Y.; Shin, E.-k.; Beak, P.; Park, Y. S. Synthesis 2006, 3805.
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33847348071
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In references 1a-c, we have established that (R)-products were provided in the substitution of N-methyl pseudoephedrine α-bromo esters with various nucleophiles. The absolute configurations of dihydroquinoxalinones 3-9 are provisionally assigned by analogy
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In references 1a-c, we have established that (R)-products were provided in the substitution of N-methyl pseudoephedrine α-bromo esters with various nucleophiles. The absolute configurations of dihydroquinoxalinones 3-9 are provisionally assigned by analogy.
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19
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33646758906
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For reviews on TBAI (or TBAB) promoted epimerization of α-halo esters or amides, see: (a) Kim, H. J.; Kim, Y.; Choi, E. T.; Lee, M. H.; No, E. S.; Park, Y. S. Tetrahedron 2006, 62, 6303.
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For reviews on TBAI (or TBAB) promoted epimerization of α-halo esters or amides, see: (a) Kim, H. J.; Kim, Y.; Choi, E. T.; Lee, M. H.; No, E. S.; Park, Y. S. Tetrahedron 2006, 62, 6303.
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