Synthesis of 5-amino-4, 5-dihydropyrazolo [3,4-d] pyrimidin-4-ones and related isomeric systems : Part I. Synthesis and characterization of potential intermediates |
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| Institution: | 1. School of Pharmaceutical Sciences, Nanjing Tech. University, Nanjing 210009, PR China;2. College of Biotechnology and Pharmaceutical Engineering, Nanjing Tech. University, Nanjing 210009, PR China;1. Dept. of Chemistry, Mangalore University, Mangalore, Karnataka State, 574199, India;2. Dept. of Studies in Physics, Manasagangothri, University of Mysore, Mysore, Karnataka State, 570006, India;3. Dept. of Physics, National Institute of Engineering, Mysore, Karnataka State, 570008, India |
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| Abstract: | Reactions between aminopyrazole-4-carboxylic acids derivatives and orthoesters or amide acetals lead, in most cases, to the introduction of a heteroalkylidene moiety on the amino group of ethyl aminopyrazole-4-carboxylates and on the β-hydrazide nitrogen atom of aminopyrazole-4-carboxhydrazides.Several factors governing the course of these reactions are discussed. |
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