Letters in Organic Chemistry - Volume 19, Issue 8, 2022

Chiral allenylcarbonyls such as allenoates remain underutilized in complex synthesis despite recent advances in synthesis methods to prepare them non-racemically. The field is now ripe for the employment of this class of allenes as building blocks to facilitate the construction of complex small-molecule compounds, such as bridged bicycles.

The synthesis of advanced substituted 3-pentafluorosulfanylphenol/anisole was accomplished starting from the easy to access and commercially available 3-pentafluorosulfanylphenol. These products bear diverse substitutions such as ester, aldehyde, halogens, alcohol, nitrile and carboxylic acid and could be in the future used as high-value building blocks for the synthesis of various scaffolds. For our part, this intermediate ha Read More

The aza-Michael addition is an attractive methodology for synthetic organic chemistry because the resulting β-aminocarbonyl compounds are valuable building blocks for the synthesis of pharmaceutically useful compounds. However, monoalkylation of aniline and its derivatives is quite difficult because anilines are poor nucleophiles compared to monoalkylated ones. Since the publication of pioneering articles in 1986, th Read More

A novel magnetite silica-coated nanoparticle-supported molybdate nanocatalyst has been prepared successfully by a simple co-precipitation method. Prepared nanocatalyst has been characterized by different techniques like Fourier Transmission Infrared Spectroscopy (FT-IR), X-ray diffraction (XRD), Field Emission Scanning Electron Microscope (FE-SEM), and Energy Dispersive X-ray Spectroscopy (EDX). Further, the c Read More

A practical and promising protocol was developed for N-arylations of various aromatic amines. This protocol was carried out through the coupling reaction between various aryl halides and phenylboronic acid using iron (III). The processes are efficiently promoted by the catalyst system involving the environmentally benign iron (III) and the state PPh3. The advantages of this method are its versatility, convenient operatio Read More

Operculina turpethum (Linn.) Silva Manso belongs to the family convolvulaceae. It is an important plant in the Indian conventional system of medicine, which is extensively employed by different tribes in many countries to cure edema and painful conditions like arthritis, back pain, hyperlipidemia, diabetes mellitus, liver disorders, skin disorders, and regulation of bowel functions. The roots of O. turpethum (Linn.) wer Read More

We reported Chickpea leaf exudates (CLEs) as a Brønsted acid, naturally available biodegradable, eco-friendly, and reusable reaction medium for highly efficient and facile one-pot synthesis of pyran-annulated heterocyclic systems, like 7-aryl-benzopyrano[4,3-b]benzopyran-6,8- diones,tetrahydrobenzo[b]pyran, and dihydropyrano[c]chromenes scaffolds. The analogous products were obtained via tandem Knoeve Read More

Halogenated furanones have been found to act as potent quorum sensing inhibitors in several bacterial species. It is believed that dihalofuranones covalently bind to the LuxS enzyme, which is necessary for autoinducer-2 synthesis. In addition to their antimicrobial activity, halogenated furanones also possess anti-cancer, antioxidant, and depigmentation properties. However, traditional routes to these compounds are lo Read More

In the present manuscript, we easily synthesized three different types of ionic liquid supported 3-quinuclidinone organocatalysts such as [PyAmEQ][BF4] (Py-CATALYST-1), [PyAmEQ][PF6] (Py-CATALYST-2), and [PyAmEQ][NTf2] (Py-CATALYST-3). After performing the careful characterization of the above catalysts with sophisticated analytical techniques, we utilized them as a catalyst to study the passive Morita-Baylis-Hillman reactio Read More

The isosteviol derived bifunctional primary amine-squaramide organocatalysts were applied in the Michael addition between nitroalkenes and acetophenone. The conjugate addition isomers of two configurations were observed with high yields (up to 93% yield) and good enantioselectivity (up to 91% ee) at room temperature.