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The synthesis of pyranol 6 by an intramolecular Prins cyclisation between 3-buten-1-ol and acetaldehyde is reversible and can go back either to the same starting materials or to formaldehyde and 4-penten- 2-ol. The latter will undergo a Prins reaction with acetaldehyde to generate 2,6-dimethylpyran-4-ol which remains essentially unreacted in the resolution step
-
The synthesis of pyranol 6 by an intramolecular Prins cyclisation between 3-buten-1-ol and acetaldehyde is reversible and can go back either to the same starting materials or to formaldehyde and 4-penten- 2-ol. The latter will undergo a Prins reaction with acetaldehyde to generate 2,6-dimethylpyran-4-ol which remains essentially unreacted in the resolution step.
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18
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0007100920
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A Ru-BINAP catalyst can be used for the preparation of methyl (S)- hydroxybutyrate 36 from methyl acetoacetate; see: Wiley & Sons: New York
-
A Ru-BINAP catalyst can be used for the preparation of methyl (S)- hydroxybutyrate 36 from methyl acetoacetate; see: Kitamura, M.; Tokunaga, M.; Ohkuma, T.; Noyori, R. Organic Syntheses; Wiley & Sons: New York, 1998;
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Kitamura, M.1
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77149134125
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Collect. Vol. 9, p 589.
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Collect
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20
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0000155207
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SEGPHOS, however, was used as ligand in place of BINAP since it gives better results for reduction of β-keto esters
-
SEGPHOS, however, was used as ligand in place of BINAP since it gives better results for reduction of β-keto esters: Saito, T.; Yokozawa, T.; Ishizaki, T.; Moroi, T.; Sayo, N.; Miura, T.; Kumobayashi, H. Adv. Synth. Catal. 2001, 343, 264.
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On a kilogram scale, lactone 17 was prepared from methyl-(S)- hydroxybutyrate by conversion to methyl-(S)-3-oxo-5-(tetrahydropy- ran-2-yloxy)hexanoate using methods developed from a published synthesis. followed by acid-catalysed cyclisation to (S)-6-methyl-5,6- dihydropyran-2,4- dione and subsequent carbonyl protection
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On a kilogram scale, lactone 17 was prepared from methyl-(S)- hydroxybutyrate by conversion to methyl-(S)-3-oxo-5-(tetrahydropy- ran-2-yloxy)hexanoate using methods developed from a published synthesis. Liu, L.; Tanke, R. S.; Miller, M. J. J. Org. Chem. 1986, 51, 5332. followed by acid-catalysed cyclisation to (S)-6-methyl-5,6- dihydropyran-2,4-dione and subsequent carbonyl protection.
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77149132256
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Prior studies on the racemic version of 23 demonstrated that the yield was compromised by formation of the product of aza-Michael addition of N-methoxymethylamine to the newly formed enone system 29. Investigation into the formation of this impurity demonstrated that it was formed during work-up, and by careful control of temperature and addition rate of the reaction quench this impurity could be minimised to less than 5%. Use of more acidic quench conditions was expected to suppress the formation of the impurity but led to some deprotection
-
Prior studies on the racemic version of 23 demonstrated that the yield was compromised by formation of the product of aza-Michael addition of N-methoxymethylamine to the newly formed enone system 29. Investigation into the formation of this impurity demonstrated that it was formed during work-up, and by careful control of temperature and addition rate of the reaction quench this impurity could be minimised to less than 5%. Use of more acidic quench conditions was expected to suppress the formation of the impurity but led to some deprotection.
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77149173960
-
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3 was found to give slightly better selectivity for pyranone 4 over pyranols 6a/6b, but the rate of reaction was slower
-
3 was found to give slightly better selectivity for pyranone 4 over pyranols 6a/6b, but the rate of reaction was slower.
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Previous work in this area has focused on the base-mediated cyclisations of the products from lithio-methoxyallene additions to carbonyls. These have been shown to cyclise to generate furan species; see: and references therein. It was our suspicion that the same type of transformation to form pyran ring systems may occur from allene alcohols derived from epoxide ring opening
-
Previous work in this area has focused on the base-mediated cyclisations of the products from lithio-methoxyallene additions to carbonyls. These have been shown to cyclise to generate furan species; see: Reissig, H.-U.; Hormuth, S.; Schade, W.; Amombo, M. O.; Toshiko, W.; Pulz, R.; Hausherr, A.; Zimmer, R. J. Heterocycl. Chem. 2000, 37, 597, and references therein. It was our suspicion that the same type of transformation to form pyran ring systems may occur from allene alcohols derived from epoxide ring opening.
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54
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84977283958
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This was in contrast, however, to a literature publication which reported formation of furans
-
This was in contrast, however, to a literature publication which reported formation of furans: Hoff, S.; Brandsma, L.; Arens, J. F. Recl. Trav. Chim. PaysBas 1969, 88, 609.
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