Isothiazoles. Part V. 1cycloaddition reaction of nitrite oxides to 3 diethylamino-4-(4-methoxyphenyl)-isothiazole 1,1-dioxide: an entry to 5-acyl- and 5-cyano-isothiazole 1,1-dioxide derivatives
作者:Franceses Clerici、Federica Ferraris、Maria L. Gelmi
DOI:10.1016/0040-4020(95)00779-8
日期:1995.11
Nitrile oxides 2 reacted with 3-diethylamino 4(4 methoxyphenyl)-isothiazole 1,1 dioxide (1) affording through a highly regioselective 1,3-dipolar cycloaddition reaction isothiazolo[5,4-d]isoxazoline 4,4 dioxides 3. Reduction of 3 afforded a mixture of the E and Z forms of the corresponding 5-(amino-aryl methylene]-dihydro-isothiazole 1,1-dioxides 4/5 which were transformed into 5-acyl-dihydro-isothiazole
氧化腈2与3-二乙氨基4(4甲氧基苯基)-异噻唑1,1二氧化物(1)反应,通过高度区域选择性的1,3-偶极环加成反应提供了异噻唑啉[5,4- d ]异恶唑啉4,4二氧化物3。还原3得到相应形式的5-(氨基-芳基亚甲基]-二氢异噻唑1,1-二氧化物4/5的E和Z形式的混合物,将其转化为5-酰基-二氢异噻唑1,1-二氧化物6。以及相应的脱水产物7.化合物3f易于转化为5-氰基异噻唑1,1-二氧化物11