Mesoionic Carbene (MIC)-Catalyzed H/D Exchange at Formyl Groups
作者:Wei Liu、Liang-Liang Zhao、Mohand Melaimi、Lei Cao、Xingyu Xu、Jean Bouffard、Guy Bertrand、Xiaoyu Yan
DOI:10.1016/j.chempr.2019.08.011
日期:2019.9
exchange at formyl groups is the most direct approach for the synthesis of deuterated aldehydes. Platinum-group metal complexes have been employed to catalyze this transformation, with significant substrate scope limitations. Although N-heterocyclic carbenes can also activate the C–Hbond of aldehydes through the formation of Breslow intermediates, benzoin condensation and other C–C-bond-forming pathways
A new chiral catalyst for the enantioselective synthesis of secondary alcohols and deuterated primary alcohols by carbonyl reduction
作者:E.J. Corey、John O. Link
DOI:10.1016/s0040-4039(01)93871-7
日期:1989.1
efficient synthesis of(S)-(−)-2-(di-β-naphthylhydroxymethyl)pyrrolidine (1) makes available the oxazaborolidine derivatives2 and3 which are excellent catalysts for borane reduction of a variety of achiral ketones to chiral secondary alcohols, e.g. acetophenone, 98% ee; α-tetralone, 95% ee; and methyl-4-oxo-4-phenyl butyrate, 96% ee. The synthesis of chiral 1-deuterio primary alcohols fromachiral aldehydes
Achiral meteoritic amino acids, glycine and α-methylalanine, with hydrogen isotope (D/H) chirality, acted as the source of chirality in asymmetric autocatalysis with amplification of ee to afford highly enantioenriched 5-pyrimidyl alkanols.
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.
Direct Detection of Hardly Detectable Hidden Chirality of Hydrocarbons and Deuterated Isotopomers by a Helical Polyacetylene through Chiral Amplification and Memory
hardly detectable hidden chirality of saturated tertiary or chiroptical quaternary hydrocarbons, and deuterated isotopomers. In sharp contrast to the previously reported sensory systems, the chirality detection by the polyacetylene relies on an excess one-handed helix formation induced by the chiral hydrocarbons and deuterated isotopomers via significant amplification of the chirality followed by its static