Zn(L-proline)2: An efficient and reusable organocatalyst for the synthesis of polyfunctionally substituted pyrans and 2-amino-4-aryl-8-oxo-4,8-dihydropyrano[3,2-b]pyran derivatives

Efficient synthesis of non-annulated 2-amino-4H-pyrans and 2-amino-8-oxo-4,8-dihydropyrano[3,2-b]pyran derivatives, which are biologically relevant heterocycles is achieved, utilizing a domino three-component reaction of ethyl acetoacetate or kojic acid with aromatic aldehydes and malononitrile catalyzed by Zn(L-proline)2 as reusable organometallic catalyst. The process exhibits high atom economy, short reaction time, simple work up, high yields and environmentally friendly nature. Excellent yields of the targeted molecules have been obtained

Spectroscopic Methods for Analysis of Nano Drug Distribution System

The size of the objects that are constituted within an alleged nano metric measurement of 1 to 100 nm is generally the main feature of nanoscience and nanotechnology. The system of unharness may be an essential method of acknowledging contained drug delivery systems in the formation of nano drug. Nanoparticles may surpass the crucial troubles of traditional little molecules / biomacromolecules, such as protein, ribonucleic acid, and DNA, utilized in several diseases through permitting objective delivery and surpassing biological obstacles. Many spectroscopical analytical techniques have been applied to define the free drug component from the nano drug formation, in various substantial cases, during various duration. One of them is analytical chemistry concerning the development of new techniques to develop old ones and supply the requirements of chemical information constrained by modern issues. Analytical chemistry is greatly affected by the development of nanoscience and nanotechnology. The aim of this review is to present a comparison of different spectroscopic analytical techniques which are presently applied to various systems of nano drug delivery to present elaborate and helpful data for other researchers