Sonogashira Cross-Couplings of Dehydroamino Acid Derivatives and Phenylacetylenes

Sonogashira cross-couplings of dehydroamino acid derivatives and phenylacetylenes

Diazotization of Aniline Derivatives and Diazo Couplings in the Presence of p-Toluenesulfonic Acid by Grinding

The solid–solid reactions of electron-donor compounds, such as: barbituric acid (1a), thiobarbituric acid (1b), 1,3-dimethyl barbituric acid (1c), phenol (1d) and resorcinol (1e) with diazotized o-nitroaniline (3), m-nitroaniline (4) and p-nitroaniline (5) catalyzed by p-toluenesulfonic acid (2) afford azo dyes by grinding in good yields. This new method totally avoids the use of inorganic acid...

Synthesis of Benzothiadiazole Derivatives by Applying C-C Cross-Couplings.

The benzothiadiazole moiety has been extensively exploited as a building block in the syntheses of efficient organic semiconducting materials during the past decade. In this paper, parallel synthetic routes to benzothiadiazole derivatives, inspired by previous computational findings, are reported. The results presented here show that various C-C cross-couplings of benzothiadiazole, thiophene, a...

Production of dehydroamino acid-containing peptides by Lactococcus lactis.

Nisin is a pentacyclic peptide antibiotic produced by some Lactococcus lactis strains. Nisin contains dehydroresidues and thioether rings that are posttranslationally introduced by a membrane-associated enzyme complex, composed of a serine and threonine dehydratase NisB and the cyclase NisC. In addition, the transporter NisT is necessary for export of the modified peptide. We studied the potent...

Synthesis, kinase inhibitory potencies and in vitro antiproliferative activity of isoindigo and 7'-azaisoindigo derivatives substituted by Sonogashira cross-coupling.

In the course of structure-activity relationship studies we were interested in the synthesis of isoindigo and 7'-azaisoindigo derivatives substituted at the N-1 position by a 1-(2,3,4,6-tetra-O-acetyl-beta-D-glucopyranosyl), at the 5'-position by various chains introduced by Sonogashira cross-coupling and substituted or not at the 5-position by a bromine atom. To get an insight into the substit...