“TPG-lite”: A new, simplified “designer” surfactant for general use in synthesis under micellar catalysis conditions in recyclable water
作者:Ruchita R. Thakore、Balaram S. Takale、Yuting Hu、Selene Ramer、Jakub Kostal、Fabrice Gallou、Bruce H. Lipshutz
DOI:10.1016/j.tet.2021.132090
日期:2021.5
Using the oxidized, carboxylic acid-containing form of MPEG-750, esterification with racemic vitamin E affords a new surfactant (TPG-lite) that functions as an enabling, nanoreactor-forming amphiphile for use in many types of important reactions in synthesis. The presence of a single ester bond is suggestive of simplified treatment as a component of (eventual) reaction waste water, after recycling
An Efficient Low-Temperature Stille-Migita Cross-Coupling Reaction for Heteroaromatic Compounds by Pd-PEPPSI-IPent
作者:Meenakshi Dowlut、Debasis Mallik、Michael G. Organ
DOI:10.1002/chem.200903337
日期:2010.4.12
The reactivity of Pd–PEPPSI (Pyridine, Enhanced, Precatalyst, Preparation, Stabilization, and Initiation) precatalysts in the Stille–Migita cross‐coupling reaction between heteroaryl stannanes and aryl or heteroaryl halides was evaluated. In general, Pd–PEPPSI–IPent (IPent=diisopentylphenylimidazolium derivative) demonstrated high efficiency over a variety of challenging aryl or heteroaryl halides
Highly Reactive, Single-Component Nickel Catalyst Precursor for Suzuki-Miyuara Cross-Coupling of Heteroaryl Boronic Acids with Heteroaryl Halides
作者:Shaozhong Ge、John F. Hartwig
DOI:10.1002/anie.201207428
日期:2012.12.14
One for all: The coupling of a range of nitrogen‐ and sulfur‐containing heteroaryl halides with five‐membered nitrogen‐, oxygen‐, and sulfur‐containing heteroaryl boronic acids were achieved in high yields with only 0.5 mol % of the single‐component nickel precatalyst [(dppf)NiCl(cinnamyl)] (dppf=1,1′‐bis(diphenylphosphanyl)ferrocene). The reaction demonstrates good functional group compatibility,
A nonionic amphiphile, TPGS-750-M, enables efficient Stille couplings between a wide range of substrates to be conducted in water as the only medium, in most cases at room temperature.