Direct Conversion of Bromohydrins to Ketones by a Free Radical Elimination of Hydrogen Bromide<sup>1</sup>
作者:Darko Dolenc、Maja Harej
DOI:10.1021/jo016113y
日期:2002.1.1
beta-bromo alcohols can be transformed directly to ketones in very good yields by a freeradical process. Tertiary beta-bromo alcohols do not react while the primary ones are transformed to aldehydes in lower yields. The reaction involves an abstraction of a hydrogen atom alpha to an OH group, followed by elimination of the bromine atom and subsequent tautomerization of an enol to a ketone.
Effect of cyclodextrin complexation in bromine addition to unsymmetrical olefins: evidence for participation of cyclodextrin hydroxyl groups
作者:Manickam C. Durai Manickam、Subramanian Annalakshmi、Kasi Pitchumani、Chockalingam Srinivasan
DOI:10.1039/b418685k
日期:——
Multiple recognition by cyclodextrin in a bimolecular reaction, namely bromination of styrene, methyl cinnamate, phenylacetylene and allylbenzene, has been studied. Bromohydrin is obtained as a major product along with dibromide in the bromination of styrene and methyl cinnamate. The percentage of bromohydrin decreases as the cavity size increases. With phenylacetylene, bromophenylacetylene and phenacyl
Stereoselective chemoenzymatic process for the preparation of optically enriched phenylglycidates as precursors of taxol side chain
申请人:COUNCIL OF SCIENTIFIC AND INDUSTRIAL
公开号:US20040259943A1
公开(公告)日:2004-12-23
The present invention relates to a novel and efficient chemoenzymatic process of preparation of optically active trans alkyl phenylglycidates. The invention particularly discloses a novel process for the chemoenzymatic synthesis of two enantiomers of trans alkyl phenylglycidate i.e. alkyl(2S,3R)-phenylglycidate and alkyl(2R,3S)-phenylglycidate of formulae 7 and 8 respectively.
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