111956-66-2Relevant articles and documents
Synthesis of novel chiral imidazolium-based ionic liquids derived from isosorbide and their applications in asymmetric aza Diels-Alder reaction
Nguyen Van Buu, Olivier,Aupoix, Audrey,Vo-Thanh, Giang
, p. 2260 - 2265 (2009)
A novel family of chiral imidazolium-based ionic liquids containing a chiral moiety and a free hydroxyl function has been designed and synthesized using isosorbide as a biorenewable substrate. These chiral ionic liquids were found to catalyze the aza Diels-Alder reaction to give good yields and moderate diastereoselectivities. Chiral ionic liquids are recycled while their efficiency is preserved.
Bio-Based Amides from Renewable Isosorbide by a Direct and Atom-Economic Boric Acid Amidation Methodology
Janvier, Marine,Moebs-Sanchez, Sylvie,Popowycz, Florence
, p. 2308 - 2318 (2016/05/19)
The functionalization of bio-sourced isohexides has proved challenging over the last number of years, especially in polymer and medicinal chemistry. We report herein the synthesis of bio-based amido-isohexides by the known boric acid catalysed amidation reaction. The coupling reaction was successfully performed with aliphatic and aromatic carboxylic acids. The extension of the scope of the reaction to eight Boc-protected amino acids is also described, the products being obtained in moderate to good yields. A preliminary screening of these new potential organocatalysts was carried out for the aldolization of isatin. We describe herein the formation of the amide bond between amines derived from dianhydrohexitols and carboxylic or amino acids mediated by a catalytic quantity of boric acid.
Aldehyde-alkene cyclizations via O-stannyl ketyl radicals using sugars as chiral auxiliaries
Enholm, Eric J.,Allais, Florent,Bareyt, Sebastian
, p. 2871 - 2874 (2007/10/03)
This investigation illustrates the utility of two inexpensive carbohydrate derivatives as sources of asymmetry for aldehyde-alkene radical cyclizations. Diastereomeric ratios as high as 9:1 were achieved with an ester-appended (+)-isosorbide and 100:1 for