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Asymmetric Alkenylation of Enones Using Binaphthols and Boronates



Год выпуска: 2014
Автор: Bobby Guobadia
Издательство: LAP Lambert Academic Publishing
Страниц: 128
ISBN: 9783659665318
Описание
Various ?,?-unsaturated carbonyl compounds and derivatives were explored in order to expand the range of substrates for the 1,4-addition of alkenylboronates using 3,3?-disubstituted binaphthols. Enones were examined and found to be suitable for conjugate addition under our proposed reaction conditions. The asymmetric 1,4-additions of alkenylboronates to enones using catalytic amounts of 3,3?-disubstituted binaphthols was shown to occur with moderate to good yields and high enantioselectivities. The chiral products could serve as enantioenriched substrates for further transformation such as asymmetric reduction, which was performed with good yield and selectivity. The absolute configuration for the alkenylation of enones was also confirmed to be the (R) enantiomer using (S)-3,3?-disubstituted binaphthols via X-ray crystallographic analysis. Investigations into selective Baeyer-Villiger oxidation of 1,4-addition products of enones was also examined. Although the desire ester products...


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