“…Pyranopyrazoles with fused oxygen heterocycle (such as pyran) and nitrogen heterocycle (such as pyrazole) play a critical role in agrochemicals through their bactericidal, insecticidal, herbicidal, acaricidal and fungicidal properties. 71 They are also used as UV-light absorbers due to their dimer-formation property under UV-light irradiation, 72 and show numerous biological and pharmacological properties. 71 b ,73 The pyrano[2,3- c ]pyrazole-based compounds are among the four most studied pyranopyrazoles, including pyrano[3,2- c ]pyrazole, pyrano[3,4- c ]pyrazole and pyrano[4,3- c ]pyrazole, which have been found in a substantial number of synthetic and natural molecules.…”