112576-12-2Relevant articles and documents
The synthesis of dendritic BINOL ligands and their applications in the enantioselective Lewis acid catalyzed addition of diethylzinc to aldehydes
Fan, Qing-Hua,Liu, Guo-Hua,Chen, Xiao-Min,Deng, Guo-Jun,Chan, Albert S. C.
, p. 1559 - 1565 (2001)
Novel dendritic chiral BINOL ligands have been synthesized through coupling of MOM-protected 3,3′-dihydroxy-methyl- binaphthol with Frechet-type polyether benzyl bromide dendrons followed by deprotection of the MOM groups using TsOH. These dendritic chira
Ruthenium-catalyzed tandem-isomerization/asymmetric transfer hydrogenation of allylic alcohols
Slagbrand, Tove,Lundberg, Helena,Adolfsson, Hans
, p. 16102 - 16106 (2015/01/09)
A one-pot procedure for the direct conversion of racemic allylic alcohols to enantiomerically enriched saturated alcohols is presented. The tandem-isomerization/ asymmetric transfer hydrogenation process is efficiently catalyzed by [{Ru(p-cymene)Cl2}2] in combination with the a-amino acid hydroxyamide ligand 1, and performed under mild conditions in a mixture of ethanol and THF. The saturated alcohol products are isolated in good to excellent chemical yields and in enantiomeric excess up to 93%.
Catalytic asymmetric addition of diethylzinc to aldehydes via chiral, non-racemic β-hydroxy and β-methoxy salicylhydrazone catalysts
Banerjee, Sucharita,Ferrence, Gregory M.,Hitchcock, Shawn R.
scheme or table, p. 837 - 845 (2010/11/02)
(1S,2S)-Pseudoephedrine and (1S,2S)-pseudonorephedrine have been converted to their corresponding hydrazines and condensed with either o-salicylaldehyde or 2-hydroxy-1-naphthaldehyde to afford a series of β- hydroxysalicylhydrazones that have been employed in the asymmetric addition of diethylzinc to 2-naphthaldehyde in up to 56% ee. In addition to this, the Ephedra hydrazines were also condensed with the o-hydroxyacetophenone derivative to form related hydrazones. The use of these corresponding hydrazones in the asymmetric addition reaction with the diethylzinc did not yield improved enantioselectivities. Finally, Enders' hydrazine was used as a chiral scaffold for the synthesis of β-methoxysalicylhydrazones. These compounds were employed in the asymmetric addition of diethylzinc to a variety of aromatic aldehydes with enantiomeric excesses as high as 68% ee.