Efficient three-step one-pot synthesis of a novel 2,3,5-substituted pyrazine library

A microwave-assisted highly practical chemoselective esterification and amidation of carboxylic acids

The ubiquitousness of esters and amide functionalities makes their coupling reaction one of the most sought-after organic transformations.

Selective Monoesterification of Symmetrical Diols Using Resin-Bound Triphenylphosphine

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 of the products are the major advantages of this protocol.

Ethyl acrylate conjugated polystyryl-diphenylphosphine — An extremely efficient catalyst for Henry reaction under solvent-free conditions (SolFC)

Over the last few decades, the fast-growing development of polymer supported reagents has led to the synthesis of a variety of reagents on solid support. Some of the major advantages of using such reagents are that they are less hygroscopic, easy to recover, and can be recycled. Here, we have demonstrated that in situ generated ethyl acrylate conjugated polystyryl-diphenylphosphine (PDPP–EA) derived from the reaction of a mixture of polystyryl-diphenylphosphine and ethyl acrylate in a stoichiometric ratio can efficiently catalyze the synthesis of β-nitroalcohols from the reaction of aldehydes and nitroalkanes under solvent-free conditions (SolFC).

Right-first-time isocratic preparative liquid chromatography-mass spectrometry purification

Preparative RP-LCMS is widely used to purify compounds from crude reaction mixtures in drug discovery today. Method development for preparative Liquid Chromatography-Mass Spectrometry (LCMS) consists of finding the right balance between speed and quality, often leading to the use of fast generic gradients (5-95% organic mobile phase) to purify compounds of various structures and polarity, which can be sometimes detrimental to the purity of the isolated compound. Isocratic elution is the best method to obtain high purity, but it usually requires a long trial and error method development to find the right eluent composition. Therefore it is mostly used to purify large quantities of product using for instance stack injections, but not for routine purification of structurally diverse compounds. Herein, we describe an empirical method that allows "right-first-time" purifications with isocratic elution on preparative RP-LCMS, permitting isolation of compounds in high purity and yield.