Base-Mediated Cascade Aldol Addition and Fragmentation Reactions of Dihydroxyfumaric Acid and Aromatic Aldehydes: Controlling Chemodivergence via Choice of Base, Solvent, and Substituents
作者:George Ward、Charles L. Liotta、Ramanarayanan Krishnamurthy、Stefan France
DOI:10.1021/acs.joc.8b01867
日期:2018.12.7
derivative of dihydroxyfumaric acid (DHF) has been used exclusively as an electrophile in organic synthesis. However, the synthetic utility of DHF’s nucleophilic reactivity, contained in the ene–diol moiety, has been underexplored. Inspired by recently observed pH-dependent chemodivergent nucleophilic aldol reactions of dihydroxyfumarate (DHF2–) with glyoxylate and formaldehyde, we report herein the control
An operationally simple protocol is reported to generate an α-hydroxyacyl anion by the decarboxylation of dihydroxyfumaricacid. To date, the “missing” utilization of the hydroxyacyl anion in highly chemo- and stereoselective cascade reactions enables short and direct construction of carbohydrates.
Tandem Benzylic Oxidation/Dihydroxylation of<i>α</i>-Vinyl- and<i>α</i>-Alkenylbenzyl Alcohols
作者:Rodney A. Fernandes、Pullaiah Kattanguru
DOI:10.1002/hlca.201400143
日期:2015.1
A de novo tandembenzylicoxidativedihydroxylation of α‐vinyl‐ and α‐alkenylbenzyl alcohols has been developed to give α,β‐dihydroxypropiophenones (=2,3‐dihydroxy‐1‐phenylpropan‐1‐ones) and α,β‐dihydroxyalkyl phenones. This method was shown to be substrate‐selective and specific for the oxidation of benzylicalcohols.