A continuous-flow approach for the multi-gram scale synthesis of C2-alkyl- or β-amino functionalized 1,3-dicarbonyl derivatives and ondansetron drug using 1,3-dicarbonyls
Literature Information
Nirmala Mohanta, Krishna Nair, Dasharath Vishambar Sutar, Boopathy Gnanaprakasam
Continuous-flow chemistry is a modern technology that encompasses the green chemistry principles for the multi-gram synthesis of various API and drugs. Herein, we have developed a highly efficient and environmentally benign metal-free alkylation of 1,3-dicarbonyl compounds using secondary alcohols in the presence of inexpensive Amberlyst®-15 under continuous-flow. This method has a broad substrate scope with a variety of secondary alcohols and water as a byproduct. The Amberlyst®-15 is recyclable and reusable for the alkylation reaction under batch/continuous-flow technology. Furthermore, a continuous-flow technology driven Mannich reaction was demonstrated under an acid-free condition. In addition, a continuous-flow Fischer indole strategy for the ondansetron with an improved yield was demonstrated. Additionally, all these reactions were demonstrated with multi-gram scale synthesis without lowering the yield under batch/continuous-flow technology.
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Reaction Chemistry & Engineering

Reaction Chemistry & Engineering is an interdisciplinary journal reporting cutting-edge research focused on enhancing the understanding and efficiency of reactions. Reaction engineering leverages the interface where fundamental molecular chemistry meets chemical engineering and technology. Challenges in chemistry can be overcome by the application of new technologies, while engineers may find improved solutions for process development from the latest developments in reaction chemistry. Reaction Chemistry & Engineering is a unique forum for researchers whose interests span the broad areas of chemical engineering and chemical sciences to come together in solving problems of importance to wider society. All papers should be written to be approachable by readers across the engineering and chemical sciences. Papers that consider multiple scales, from the laboratory up to and including plant scale, are particularly encouraged.














