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Volumn , Issue 11, 1999, Pages 2713-2724

The dienolate [2,3]-Wittig rearrangement - Diastereoselective synthesis of highly functionalized tertiary alcohols

Author keywords

Alcohols; Aldol addition; Dienolates; 2,3 Wittig rearrangement

Indexed keywords

ALCOHOL; ESTER;

EID: 0032701158     PISSN: 1434193X     EISSN: None     Source Type: Journal    
DOI: 10.1002/(sici)1099-0690(199911)1999:11<2713::aid-ejoc2713>3.0.co;2-e     Document Type: Article
Times cited : (18)

References (75)
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    • note
    • The terms syn and anti are utilized to assign the relative configurations based on the formulae depicted in Schemes 8 and 9. The substituted pentenoic acid is the product backbone of an enolate and dienolate [2,3]-Wittig rearrangement. For the sake of consistency with previous publications, we prefer to use the terms syn and anti based on the depicted projection.
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    • The same effect was found to stabilize the calculated transition state of the [2,3]-Wittig rearrangement of a crotyloxy acetaldehyde enolate, see: [19b] K. Mikami, T. Uchida, T. Hirano, Y. Wu, K. N. Houk, Tetrahedron 1994, 50, 5917-5926.
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    • It should be mentioned that we do not consider the influence of the base on the mechanism. The base should play a pivotal role with respect to the deprotonation mechanism and the fate of the protonated base. These effects can profoundly influence the course of the reaction of ester enolates; for an example, see: J. Mulzer, M. Hiersemann, J. Buschmann, P. Luger, Liebigs Ann. 1996, 649-654.
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    • note
    • In a control experiment, the allyloxy-substituted ester 2b was deprotonated with LDA in THF at -78°C. The reaction mixture was stirred at -78°C for 19 h to provide only traces of the [2,3]-Wittig rearrangement product. Mainly starting material was isolated.


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