Green one-pot four-component synthesis of 3,5-disubstituted isoxazoles- sulfonates and sulfonamides using a combination of NaDCC as metal-free catalyst and ultrasonic activation in water
simple and green one-pot reaction has been proposed for the synthesis of novel 3,5-disubstituted isoxazole-sulfonates and -sulfonamides () in water under ultrasound irradiation. The methodology is based on the use of safe and environmentally friendly reagents and allows, 1,3-dipolar cycloaddition, an easy access to functionalized heterocycles with the creation of four new bonds (SO, CN, CO and CC). Comparison