作者:Xueyan Yang、Shengxia Shui、Xi Chen、Hai’ou He、Fanhong Wu
DOI:10.1016/j.jfluchem.2009.12.017
日期:2010.3
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
溴二
氟甲基取代的
β-二酮3a-3d,是由相应的酮和
溴二氟乙酸乙酯在
甲醇钠存在下制得的,与芳基
肼衍
生物反应,得到具有高区域选择性的
溴二
氟甲基取代的
吡唑。3a–3d与
羟胺盐酸盐的反应生成二氢
异恶唑,后者通过
PPA或浓
硫酸脱
水而制得
溴二
氟甲基取代的
异恶唑。