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See ref. [6b ]
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See ref. [6b) ].
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0000697582
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4-induced π-cyclization reaction of methyl 2-acetoxy-2-(3-alken-1-oxy)acetate to five- and six-membered-ring ethers proceeds by a 2-oxonia [3.3]-sigmatropic rearrangement
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4-induced π-cyclization reaction of methyl 2-acetoxy-2-(3-alken-1-oxy)acetate to five- and six-membered-ring ethers proceeds by a 2-oxonia [3.3]-sigmatropic rearrangement:
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0028360370
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Many other intramolecular C-C bond formation reactions that proceed by an intramolecular Prins reaction of an oxycarbenium ion with π-nucleophile have been investigated for the syntheses of five- and six-membered cyclic ethers
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47
-
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0347676883
-
-
note
-
The reaction conditions shown in Table 1 (entry 5) were applicable.
-
-
-
-
48
-
-
0347676881
-
-
note
-
Treatment using higher concentrations (0.5 M) and/or longer reaction times (4-5 h) resulted in an increase of (E)-14d with lower optical purity, and the incomplete consumption of the starting material, syn13d.
-
-
-
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49
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0001649946
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b) W. R. Roush, K. Ando, D. B. Powers, A. D. Palkowitz, R. L. Halterman, J. Am. Chem. Soc. 1990, 112, 6339-6348.
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-
51
-
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0345784877
-
-
note
-
Hydrogen chloride (1.0M solution in anhydrous ether; purchased from Aldrich) was effective for this reaction.
-
-
-
-
52
-
-
0347046195
-
-
note
-
It seems reasonable that the additives would serve as a Lewis acid for the common allylation by an inactive allylic metal such as 4 to give the syn-γ-adduct 2 predominantly, and then as a catalyst for the allyl-transfer reaction from γ to α with Z selectively. However, the actual catalyst for the reaction is not completely clear, because a Brønsted acid such as HCl also served as a good catalyst, and will be easily formed from a Lewis acid with alcohol (substrate of the reaction) or moisture.
-
-
-
-
53
-
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0346415921
-
-
note
-
2 to give good results, many of the previously reported α-allylation reactions (described in A) were performed at a lower temperature for shorter reaction times with more than stoichiometric amounts of additives. It should be noted, however, that the in situ formed γ-adduct (Lewis acid complex) derived from an aldehyde and an allylic metal with additive (Lewis acid), would be much more reactive than the corresponding alcohol used in our reaction. The complex would smoothly react with a large amount of unreacted aldehyde, existing in the reaction mixture before the reaction with allylic metal, to give the oxycarbenium ion. We believe that this allyl-transfer reaction will play an important role in many α-selective allylation reactions.
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