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Amrita Das

Bio: Amrita Das is an academic researcher from Osaka University. The author has contributed to research in topics: Mathematics & Computer science. The author has an hindex of 6, co-authored 13 publications receiving 97 citations. Previous affiliations of Amrita Das include Kyushu University & Indian Institutes of Technology.

Papers
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Journal ArticleDOI
TL;DR: In this article, the authors summarize the strategic evolution of directed C-H bond activation chemistry in this review and feel that this review would be of particular interest to scientists who are interested in progress made in the area of directed H-B bond functionalization, which could stimulate new areas of research regarding this significant topic.

129 citations

Journal ArticleDOI
TL;DR: A superacid promoted one-pot process for the efficient synthesis of indanones is presented in this article, which enabled the formation of a dual C-C bond between aryl isopropyl ketones and benzaldehydes.
Abstract: A superacid promoted one-pot process for the efficient synthesis of indanones is presented. This process enabled the formation of a dual C–C bond between aryl isopropyl ketones and benzaldehydes. Interestingly, when the reaction was performed between acetophenones and benzaldehydes, it was impeded just after the aldol condensation and resulted in the corresponding chalcones.

28 citations

Journal ArticleDOI
TL;DR: Boronic acid was used to accelerate a three-component reaction of indoles, thiols, and glyoxylic acids for the synthesis of α-sulfanyl-substituted indole-3-acetic acids.

16 citations


Cited by
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Journal ArticleDOI
TL;DR: The NLO properties of the obtained CD arrays were significantly different from those of a CD suspension, thus indicating the existence of collective phenomena.
Abstract: Arrays of ultrasmall and uniform carbon nanodots (CDs) are of pronounced interest for applications in optical devices. Herein, we describe a low-temperature calcination approach with rather inexpensive reactants. After glucose molecules had been loaded into the pores of metal–organic frameworks (MOFs), well-defined CD arrays were produced by heating to 200 °C. The size and spacing of the CDs could be controlled by the choice of templating MOF: HKUST-1, ZIF-8, or MIL-101. The sizes of the obtained CDs were approximately 1.5, 2.0, and 3.2 nm, which are close to the corresponding MOF pores sizes. The CD arrays exhibited interesting photophysical properties, including photoluminescence with tunable emission and pronounced nonlinear optical (NLO) effects. The NLO properties of the obtained CD arrays were significantly different from those of a CD suspension, thus indicating the existence of collective phenomena.

165 citations

Journal ArticleDOI
TL;DR: The present Review is aimed at presenting some of the most important and innovative approaches to indanes and indenes that have been published in the course of the last ten years (coverage: from 2005 to May, 2015).
Abstract: Indanes and indenes are among the most important carbocycles. Many indane and indene derivatives have shown important pharmacological activities, and the indane and indene nuclei are structural motifs present in several natural products of biological relevance. In spite of their importance, only a few reviews on their preparation methods have appeared so far in the literature, the most recent ones being published about ten years ago. The present Review is aimed at filling this gap, presenting some of the most important and innovative approaches to indanes and indenes that have been published in the course of the last ten years (coverage: from 2005 to May, 2015).

145 citations

Journal ArticleDOI
TL;DR: Analysis of novel synthetic approaches to fluorinated pyrazoles that appeared in recent years is performed, with a particular emphasis on a detailed consideration of reaction mechanisms.
Abstract: Fluorinated pyrazoles play an important role in medicinal chemistry, drug discovery, agrochemistry, coordination chemistry, and organometallic chemistry. Since the early 1990s, their popularity has grown exponentially. Moreover, more than 50% of all contributions on the topic have been published in the last 5 years. In this review, analysis of novel synthetic approaches to fluorinated pyrazoles that appeared in recent years is performed. A particular emphasis is devoted to a detailed consideration of reaction mechanisms. In addition, the reasons that have led to the ever-increasing popularity of fluorinated pyrazoles in various areas of science are discussed. At the end of the review, several potentially interesting but yet mostly unknown classes of fluorinated pyrazoles are outlined.

126 citations

Journal ArticleDOI
TL;DR: A greener protocol for the synthesis of 3-Se/S-indoles and imidazo[1,2-a]pyridines through direct C(sp2 )-H bond chalcogenation of heteroarenes with half molar equivalents of different dichalCogenides, using KIO3 as a non-toxic, easy-to-handle catalyst and a stoichiometric amount of glycerol.
Abstract: Herein, we report a greener protocol for the synthesis of 3-Se/S-indoles and imidazo[1,2-a]pyridines through direct C(sp2 )-H bond chalcogenation of heteroarenes with half molar equivalents of different dichalcogenides, using KIO3 as a non-toxic, easy-to-handle catalyst and a stoichiometric amount of glycerol. The reaction features are high yields, based on atom economy, easy performance on gram-scale, metal- and solvent-free conditions as well as applicability to different types of N-heteroarenes.

97 citations

08 Jul 2018
TL;DR: A mild and selective C(sp3)−H aerobic oxidation enabled by decatungstate photocatalysis has been developed and the reaction can be significantly improved in a microflow reactor enabling the safe use of oxygen and enhanced irradiation of the reaction mixture.
Abstract: Abstract A mild and selective C(sp3)−H aerobic oxidation enabled by decatungstate photocatalysis has been developed. The reaction can be significantly improved in a microflow reactor enabling the safe use of oxygen and enhanced irradiation of the reaction mixture. Our method allows for the oxidation of both activated and unactivated C−H bonds (30 examples). The ability to selectively oxidize natural scaffolds, such as (−)‐ambroxide, pregnenolone acetate, (+)‐sclareolide, and artemisinin, exemplifies the utility of this new method.

97 citations