The enantioselective borodeuteride reduction of aldehydes catalyzed by opticallyactive β-ketoiminato cobalt complexes afforded the corresponding chiral deuterated primary alcohols with a high degree of deuteration and good enantiomeric excess.
Asymmetric Transfer Hydrogenation of Benzaldehydes
作者:Issaku Yamada、Ryoji Noyori
DOI:10.1021/ol0002119
日期:2000.11.1
[GRAPHICS]A combined system of RuCl[(R,R)-YCH(C6H5)CH(C6H5)NH2](eta (6)-arene) (Y = NSO2C6H4-4-CH3 or O) and t-C4H9OK catalyzes the asymmetric transfer hydrogenation of various benzaldehyde-1-d derivatives with 2-propanol to yield (R)-benzyl-1-d alcohols in 95-99% ee and with >99% isotopic purity. Reaction of benzaldehydes with a DCO2D-triethylamine mixture and the R,R catalyst affords the S deuterated alcohols in 97-99% ee.
Computational and experimental structure–reactivity relationships: evidence for a side reaction in Alpine-Borane reductions of d-benzaldehydes
作者:Hui Zhu、N. Soledad Reyes、Matthew P. Meyer
DOI:10.1016/j.tetlet.2009.09.109
日期:2009.12
borabicyclo[3.3.1]nonane (Alpine-Borane). This is likely because of the extreme size disparity of groups on either side of the carbonyl. Here, we present a structure-reactivity study whereby the reductions of variably substituted d-benzaldehydes are explored using highly sensitive measures for enantiomeric excess and relative reactivity. These results are compared to the relativerates predicted from
A Very Reliable Method for Determination of Absolute Configuration of Chiral Secondary Alcohols by <sup>1</sup>H NMR Spectroscopy
作者:Yoshio Takeuchi、Hidehito Fujisawa、Ryoji Noyori
DOI:10.1021/ol0479489
日期:2004.11.1
Surprisingly stable synperiplanar conformers of CFTA esters have led us to develop a new and very reliable method for assigning absoluteconfigurations of even secondaryalcohols having minimal structural differences, such as chiral benzhydrols and alpha-monodeuterated benzyl alcohols.