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Being an important constituent of naturally occurring heterocyclic compounds with a myriad of interesting biological activities, the furocoumarin motif has claimed vast interest in synthetic and medicinal research. Designing organic synthesis following a green and sustainable approach finds special importance in terms of energy efficiency, and cost‐effectiveness and hence becoming an important domain of research in the recent past. The methodologies for the sustainable synthesis of furocoumarin presented here particularly include the strategies developed under microwave irradiation, solvent‐free conditions or uses of green solvent, metal‐free routes, room temperature mediated and following one‐pot MCR reactions. This review article attempts to highlight the recent advances in the sustainable synthesis of furocoumarins along with general aspects like natural occurrence, and biological activities of this particular heterocyclic scaffold. [ABSTRACT FROM AUTHOR]

Crop residue burning is a major environmental issue and their potential long-term impact on the climate is a global concern. A laboratory experiment was carried out to study the impact of biochar on carbon loss from tropical soils. Residues of two important foodgrain crops viz, rice and wheat were used to prepare respective biochar and added as amendments in two different tropical agricultural soils (red and alluvial). In general carbon loss was more from alluvial soil than red soil. In alluvial soil, carbon loss was more when biochars were applied along with N fertilizer (urea) than biochar alone. Increasing rate of application of rice biochar without urea showed potential carbon protection in alluvial soil. Interestingly, unlike rest of the treatments, carbon loss was more in red soil when wheat biochar was applied without urea than with it. While physicochemical characteristics of biochars play crucial role in carbon protection, the intrinsic nature and properties of soil largely regulates it. © 2015 American Institute of Chemical Engineers Environ Prog, 35: 183-188, 2016 [ABSTRACT FROM AUTHOR]

The transformation follows an initial iodine-catalyzed reaction of 4-hydroxycoumarins with carbonyl compounds to biscoumarins followed by lactone ring opening, cyclization, and oxidative aromatization. [ABSTRACT FROM AUTHOR]

A diagram is presented which shows the chemical formula for the derivatives of barbituric acid, and the synthesis and function of annulated barbituric acids.

The article presents information on an multi-component synthesis of Pyrimido[4,5-d]pyrimidine derivatives in water.

A four-step sequence is presented for the conversion of 4-hydroxycoumarin into spiro substituted pyridocoumarin (VIII). [ABSTRACT FROM AUTHOR]

A simple protocol allows the synthesis of various biologically interesting title systems. [ABSTRACT FROM AUTHOR]

The reaction of uracils, aryl halides and 3-cyanoacetyl indole produces the pharmaceutically interesting title compounds (IV) and (VII). [ABSTRACT FROM AUTHOR]