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85023333336
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3, MeOH, reflux)
-
is effective with 2,3-epoxy amides (vide infra) but much less effective with 2,3-epoxy alcohols
-
3, MeOH, reflux) is effective with 2,3-epoxy amides (vide infra) but much less effective with 2,3-epoxy alcohols.
-
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16
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85023342440
-
The regioselectivities in the epoxide-opening reactions were assigned on the basis of the diagnostic chemical shifts
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3(δ 3.3—3-9), and RR'CHOAc (δ 1.9-2. 2) of the peracetylated products were found to be particularly useful
-
3(δ 3.3—3-9), and RR'CHOAc (δ 1.9-2.2) of the peracetylated products were found to be particularly useful.
-
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18
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37049103547
-
For an example in which the trans-diaxial opening rule is violated to avoid neopentyl substitution
-
1H NMR spectrum of the unpurified diol product mixture and in the unpurified product mixture after peracetylation with pyridine and acetic anhydride. The signals of the hydroxyl proton (δ1.7-2.9) of the diol products and the signals corresponding to RR'CHOAc (δ 5–6), RR'CHSPh (δ 2–3), and RR'CHOAc (δ 1.7-2.2) of the peracetylated products were found to be particularly useful
-
1H NMR spectrum of the unpurified diol product mixture and in the unpurified product mixture after peracetylation with pyridine and acetic anhydride. The signals of the hydroxyl proton (δ1.7-2.9) of the diol products and the signals corresponding to RR'CHOAc (δ 5–6), RR'CHSPh (δ 2–3), and RR'CHOAc (δ 1.7-2.2) of the peracetylated products were found to be particularly useful.
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85023295495
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4NBr (10 equiv) in MeOH (0.1 M solution) yielded the bromohydrindimethyl acetal, which then, was converted to the desired epoxy acetal by treatment with a base. This is clearly the best route to homochiral epoxy acetals provided the rest of the molecule can tolerate the strong acidity of the first step. Gao, Y.; Sharpless, K. B., unpublished results. (formula omitted) (32) Foster, A. B. In “ The Carbohydrates ”Pigman, W., Horton, D., Eds.; Academic Press: New York, 1972; Vol. 1A, p 391.
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4NBr (10 equiv) in MeOH (0.1 M solution) yielded the bromohydrindimethyl acetal, which then, was converted to the desired epoxy acetal by treatment with a base. This is clearly the best route to homochiral epoxy acetals provided the rest of the molecule can tolerate the strong acidity of the first step. Gao, Y.; Sharpless, K. B., unpublished results. (formula omitted) (32) Foster, A. B. In “The Carbohydrates”Pigman, W., Horton, D., Eds.; Academic Press: New York, 1972; Vol. 1A, p 391.
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trans-2,3-Epoxy acids have been found to react with organocuprates selectively at C-2, whereas cis-2,3-epoxy acids react with the same reagents selectively at C-3
-
in press These cuprate openings of glycidic acids are not necessarily related to the chelation phenomena described in ref 25 and 43 and are only mentioned here for the sake of readers who are generally interested in the reaction of epoxy alcohols and their derivatives
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trans-2,3-Epoxy acids have been found to react with organocuprates selectively at C-2, whereas cis-2,3-epoxy acids react with the same reagents selectively at C-3 (Chong, J. M.; Sharpless, K. B. Tetrahedron Lett., in press). These cuprate openings of glycidic acids are not necessarily related to the chelation phenomena described in ref 25 and 43 and are only mentioned here for the sake of readers who are generally interested in the reaction of epoxy alcohols and their derivatives.
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Tetrahedron Lett.
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Chong, J.M.1
Sharpless, K.B.2
|