Reaction of chromones with hydroxylamine in anhydrous methanol
作者:Vince Szabó、János Borbély、Edit Theisz、Sándor Nagy
DOI:10.1016/s0040-4020(01)87646-8
日期:1986.1
The reaction of 4H-1-benzopyran-4-one (chromone, ,) and its substituted derivatives with hydroxylamine in aqueous alcohols gives isoxazoles and , as the major products, whereas is transformed mainly into with hydroxylamine hydrochloride in anhydrous methanol, compounds , and can be also isolated, and the formation of and has been detected, as well. Depending on the character of the substituent, substituted