Scope and Mechanistic Insights into the Use of Tetradecyl(trihexyl)phosphonium Bistriflimide: A Remarkably Selective Ionic Liquid Solvent for Substitution Reactions
作者:James McNulty、Jerald J. Nair、Sreedhar Cheekoori、Vladimir Larichev、Alfredo Capretta、Al J. Robertson
DOI:10.1002/chem.200600653
日期:2006.12.13
A survey of substitutionreactions conducted in a phosphoniumbistriflimideionicliquid is presented. The results demonstrate high selectivity favoring substitution over typically competitive elimination and solvolytic processes even when challenging secondary and tertiary electrophiles are employed. The first reports of Kornblum substitutionreactions in an ionicliquid are described that proceed
Selective Monoesterification of Symmetrical Diols Using Resin-Bound Triphenylphosphine
作者:Gunindra Pathak、Samuel Lalthazuala Rokhum
DOI:10.1021/acscombsci.5b00086
日期:2015.9.14
Coupling reactions to make esters and amides are among the most widely used organic transformations. We report efficient procedures for amide bond formation and for the monoesterification of symmetrical diols in excellent yields without any requirement for high dilution or slow addition using resin-bound triarylphosphonium iodide. Easy purification, low moisture sensitivity, and good to excellent yields
efficient method involving pyridine activation of the carboxylate–phosphate anhydride pathway is described resulting in a direct synthesis of esters from carboxylic acids and alcohols, as well as in the formation of useful amide and peptide derivatives. The reaction proceeds with retention of configuration with both chiral secondary alcohols and α-amino acidderivatives. Ester and amide products can
carboxylate–phosphate anhydride pathway is described for the direct, economical synthesis of esters and amides from carboxylic acids and alcohols or amines. The reaction proceeds with retention of configuration with both chiral secondary alcohols and α-aminoacid derivatives allowing access to useful chiral auxiliaries, ligands, and organocatalysts. Ester and amide products can be isolated directly in high yield due