Synthesis of bromodifluoromethyl substituted pyrazoles and isoxazoles
X Yang, S Shui, X Chen, F Wu
Index: Yang, Xueyan; Shui, Shengxia; Chen, Xi; He, Hai'ou; Wu, Fanhong Journal of Fluorine Chemistry, 2010 , vol. 131, # 3 p. 426 - 432
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Citation Number: 11
Abstract
Bromodifluoromethyl substituted β-diketone 3a–3d, prepared from corresponding ketones and ethyl bromodifluoroactate in the presence of sodium methoxide, reacted with aryl hydrazine derivatives affording bromodifluoromethyl substituted pyrazoles in high regioselectivity. The reaction of 3a–3d with hydroxylamine hydrochloride gave dihydroisoxazoles, which afforded bromodifluoromethyl substituted isoxazoles through ...
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