Reactions of 3,3-dialkyl-2,3-dihydro-6-trifluoromethyl-4-pyrones with hydroxylamine. Synthesis and structures of 5-(1,1-dialkyl-2-hydroxyethyl)-5-hydroxy-3-trifluoromethyl-Δ2-isoxazolines
作者:V. Ya. Sosnovskikh、M. Yu. Mel'nikov、S. A. Pogozhikh
DOI:10.1007/bf02495297
日期:1999.7
The reactions of 3,3-dialkyl-2,3-dihydro-6-trifluoromethyl-4-pyrones with hydroxylamine hydrochloride afforded regioisomeric 3(5)-(1,1-dialkyl-2-hydroxyethyl)-5-hydroxy-5(3)-trifluoromethyl-Δ2-isoxazolines depending on the reaction conditions. The title compounds were also prepared from 2,2-dialkyl-5-amino-1-hydroxy-6,6,6-trifluorohex-4-en-3-ones. The above dihydropyrones reacted with hydroxylamine
3,3-二烷基-2,3-二氢-6-三氟甲基-4-吡喃酮与盐酸羟胺反应得到区域异构体3(5)-(1,1-二烷基-2-羟乙基)-5-羟基-5( 3)-三氟甲基-Δ2-异恶唑啉取决于反应条件。标题化合物也由 2,2-二烷基-5-氨基-1-羟基-6,6,6-三氟己基-4-烯-3-酮制备。上述二氢吡喃酮与羟胺(碱)反应生成 3-(1,1-二烷基-2-羟乙基)-5-羟基-5-三氟甲基-Δ2-异恶唑啉。