Absolute Configuration of Ketone Cyanohydrins by <sup>1</sup>H NMR: The Special Case of Polar Substituted Tertiary Alcohols
作者:Iria Louzao、Rosa García、José Manuel Seco、Ricardo Riguera
DOI:10.1021/ol8023314
日期:2009.1.1
The absolute configuration of ketone cyanohydrins can be assigned from analysis of the 1H NMR spectra of the corresponding (R)- and (S)-MPA ester derivatives and use of ΔδRS signs. This is an application of the NMR methodology for stereochemical assignment to tertiary alcohols possessing polar groups as substituents.
酮氰醇的绝对构型可以从分析被分配1个相应的(的1 H NMR谱- [R和( - )小号)-MPA酯衍生物和使用Δδ RS迹象。这是NMR方法在立体化学上分配给具有极性基团作为取代基的叔醇的应用。
Cyano-borrowing reaction: nickel-catalyzed direct conversion of cyanohydrins and aldehydes/ketones to β-cyano ketone
作者:Zhao-Feng Li、Qian Li、Li-Qing Ren、Qing-Hua Li、Yun-Gui Peng、Tang-Lin Liu
DOI:10.1039/c9sc00640k
日期:——
nickel-catalyzed, high atom- and step-economical reaction of cyanohydrins with aldehydes or ketones via an unprecedented “cyano-borrowing reaction” has been developed. Cleavage of the C–CN bond of cyanohydrins followed by aldol condensation and conjugate addition of cyanide to α,β-unsaturated ketones proceeded to deliver a range of racemic β-cyano ketones with good to high yields. The practical procedure