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Volumn , Issue 17, 2009, Pages 2806-2819

New options for the reactivity of the burgess reagent with epoxides in both racemic and chiral auxiliary modes - Structural and mechanistic revisions, computational studies, and application to synthesis

Author keywords

Amino alcohol derivatives; Balanol; Burgess reagent; Chiral auxiliaries; Density functional calculations; Enantioselectivity; Structure revisions; Sulfamidate synthesis

Indexed keywords


EID: 66449125307     PISSN: 1434193X     EISSN: 10990690     Source Type: Journal    
DOI: 10.1002/ejoc.200900159     Document Type: Article
Times cited : (14)

References (64)
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    • [2b]) published in 2000: The compatibility of the Burgess reagent with many functionalities, e.g. halogens, epoxides, alkenes, alkynes, aldehydes, ketones, acetals, esters, secondary amides, makes it an attractive technique for the introduction of C-C double bonds into highly functionalized molecules.
    • [2b]) published in 2000: "The compatibility of the Burgess reagent with many functionalities, e.g. halogens, epoxides, alkenes, alkynes, aldehydes, ketones, acetals, esters, secondary amides, makes it an attractive technique for the introduction of C-C double bonds into highly functionalized molecules. ""
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    • Cyclic epoxides proximal to alcohols react with the Burgess reagent to form sulfamidates (ref. 14). Distally located epoxides appear inert provided excess reagent is not used. See A. A. Nagel, J DiBrino, L. A. Vincent, J A. Retsema, J. Med. Chem. 1982, 25, 881-884. It was likely this report that led to the belief in inertness of epoxides.
    • Cyclic epoxides proximal to alcohols react with the Burgess reagent to form sulfamidates (ref. 14). Distally located epoxides appear inert provided excess reagent is not used. See A. A. Nagel, J DiBrino, L. A. Vincent, J A. Retsema, J. Med. Chem. 1982, 25, 881-884. It was likely this report that led to the belief in inertness of epoxides.
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    • For reviews on synthesis and reaction of cyclic sulfates see: a) B. B. Lohray, Synthesis 1992, 1035-1.052;
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    • To the best of our knowledge, as of this report, there have been no previous computational studies addressing the Burgess reagent's reactivity.
    • To the best of our knowledge, as of this report, there have been no previous computational studies addressing the Burgess reagent's reactivity.
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    • For additional details regarding the procedural, details associated with these PES scans, see SI.
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    • See Supporting Information for calculated transition states. Owing to their higher activation barrier subsequent steps along this pathway were not considered
    • See Supporting Information for calculated transition states. Owing to their higher activation barrier subsequent steps along this pathway were not considered.
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    • Although even this reaction barrier is slightly too high, it was by far the lowest out of all the mechanistic possibilities considered
    • Although even this reaction barrier is slightly too high, it was by far the lowest out of all the mechanistic possibilities considered.
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    • Wiberg bond indices for pertinent bond forming/breaking distances during 5-mem-TSl: C-N: 0.1588, C...O: 0.3007, and O....S: 0.4358.
    • b) Wiberg bond indices for pertinent bond forming/breaking distances during 5-mem-TSl: C-N: 0.1588, C...O: 0.3007, and O....S: 0.4358.
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    • An Intrinsic Reaction Coordinate (IRC) calculation confirmed that cis-5-mem sulfamidate was the immediate product of 5-mem-TSl.
    • An Intrinsic Reaction Coordinate (IRC) calculation confirmed that cis-5-mem sulfamidate was the immediate product of 5-mem-TSl.
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    • See Supporting Information for details regarding these searches
    • See Supporting Information for details regarding these searches.
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    • Multiple attempts were made to locate 5-mem-TSl in the presence of an epoxide bound Lewis acid, none of these attempts were successful in locating energetically feasible transition states.
    • Multiple attempts were made to locate 5-mem-TSl in the presence of an epoxide bound Lewis acid, none of these attempts were successful in locating energetically feasible transition states.
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    • For example a. reaction dynamic involving Brønsted acidic trimethylanimonium (a likely degradation product of Burgess reagent) was computed, and shown to have a reduced barrier to cyclohexene oxide ring opening as compared with that of the uncatalyzed processes (i.e. 5-mem-TSl).
    • For example a. reaction dynamic involving Brønsted acidic trimethylanimonium (a likely degradation product of Burgess reagent) was computed, and shown to have a reduced barrier to cyclohexene oxide ring opening as compared with that of the uncatalyzed processes (i.e. 5-mem-TSl).


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.