Synthesis of a series of pyrano[2,3-c]pyrazole compounds through microwave method

The present invention discloses a preparation method for a series of pyrano[2,3-c]pyrazole compounds, wherein the class of the compounds relate to a general formula (I), and R is defined in the instruction. According to the present invention, the microwave heating method is utilized, a series of the pyrano[2,3-c]pyrazole compounds are cleanly, quickly and efficiently synthesized through the one-pot method, and advantages of high selectivity, easy operation, less by-products, low pollution, green environmental protection and the like are provided. The formula (I) is defined in the instruction.