10.6084/m9.figshare.1132637.v3 Pravin G. Hegade Pravin G. Hegade Mansing M. Mane Mansing M. Mane Jayavant D. Patil Jayavant D. Patil Dattaprasad M. Pore Dattaprasad M. Pore Sulfamic Acid: A Mild, Efficient, and Cost-Effective Catalyst for Synthesis of Indoloquinoxalines at Ambient Temperature Taylor & Francis Group 2014 ninhydrin efficient ambient temperature Indoloquinoxaline variety mild workup procedure catalyst method sulfamic acid synthesis diketone isolation yield hydroxynaphthaquinone isatin Synthesi sulfamic 2014-10-15 20:09:38 Journal contribution https://tandf.figshare.com/articles/journal_contribution/Sulfamic_Acid_A_Mild_Efficient_and_Cost_Effective_Catalyst_for_Synthesis_of_Indoloquinoxalines_at_Ambient_Temperature/1132637 <div><p></p><p>A simple, cost-effective method for synthesis of indoloquinoxalines from isatin and <i>o</i>-phenylenediamine employing a catalytic amount of sulfamic acid at ambient temperature is reported. Moreover, the method is applicable for a variety of isatins, ninhydrin, 4-hydroxynaphthaquinone, and 1,2-diketones. The key features of the protocol include rapid reactions with good yields, simple workup procedure, and easy isolation of products.</p> </div>