Urea as an Ammonia Surrogate in the Hantzsch’s Synthesis of Polyhydroquinolines / 1,4-dihydropyridines under Green Reaction Conditions

Title:Urea as an Ammonia Surrogate in the Hantzsch’s Synthesis of Polyhydroquinolines / 1,4-dihydropyridines under Green Reaction Conditions

Volume: 18 Issue: 3

Author(s): G. Dhananjaya, Akula Raghunadh, P. Mahesh Kumar, S. Pulla Reddy, V. Narayana Murthy, Venkateswara Rao Anna*Manojit Pal*

Affiliation:

• Department of Chemistry, Koneru Lakshmaiah Education Foundation, Vaddeswaram, 522502, Guntur District, Andhra Pradesh,India

• Dr Reddy’s Institute of Life Sciences, University of Hyderabad Campus, Gachibowli, Hyderabad 500 046,India

Keywords: Urea, Hantzsch's reaction, Catalyst, Green reaction.

Abstract: Synthesis of polyhydroquinolines via Hantzsch’s multicomponent reaction (MCR) involves the use of a hygroscopic and moderately toxic ammonium salt as one of the key reactants. In our effort, we have found urea as an effective ammonia surrogate when the MCR was performed in the presence of sulphonic acid-functionalized Wang resin (Wang-OSO₃H) as a polymeric and recoverable acidic catalyst under green conditions. Urea is relatively less hygroscopic/toxic than the commonly used ammonium salts used in this MCR. The methodology afforded a range of polyhydroquinolines in good yields. Depending on the nature of reaction conditions employed, the MCR afforded Biginelli product or 1,4-DHPs when the use of 1,3-diketone was omitted.

Cite this article as:

Dhananjaya G. , Raghunadh Akula , Kumar Mahesh P. , Reddy Pulla S. , Murthy Narayana V. , Anna Rao Venkateswara *, Pal Manojit *, Urea as an Ammonia Surrogate in the Hantzsch’s Synthesis of Polyhydroquinolines / 1,4-dihydropyridines under Green Reaction Conditions, Letters in Organic Chemistry 2021; 18 (3) . https://dx.doi.org/10.2174/1570178617999200713144504