Preparation of fluorinated phenoxathiin dioxide monoamine oxidase-A inhibitors: Intramolecular radical substitution at sulfur<i>versus</i>the mauthner synthesis
作者:Eric E. Boros、William R. Hall、Morton Harfenist、James L. Kelley、Mark D. Reeves、Virgil L. Styles
DOI:10.1002/jhet.5570350332
日期:1998.5
7-difluorophenoxathiin analog 7c, a result consistent with a Smiles rearrangement of the intermediate thiol 12 prior to ring closure. The phenoxathiins 14 were ultimately prepared by a modification of a relatively unexploited phenoxathiin synthesis involving the intramolecular radical substitution at sulfur of 2-aminophenyl 2-thiophenyl ethers 13 containing para-methoxybenzyl and methoxymethylthio-protecting
通过相应的苯氧并ath菌素7和14的氧化反应,制备了五种独特的单胺氧化酶-A抑制剂3-异丙氧基苯氧并ath嗪10,10-二氧化物(II)的氟化类似物8a-c和15a,b。3-氟-7-异丙氧基-图7a,2-氟-3-异丙氧基- 7B,和2,7-二氟-3- isopropoxyphenoxathiin(图7c)是由毛特纳合成的改进方法制备,其相应的2-涉及环化在叔酸钾存在下,将羟基-4-异丙氧基硫代苯酚4与适当的2-卤代硝基苯5-丁氧化物。从4b和2,4-二氟硝基苯(5c)采用类似方法制备2,8-二氟-3-异丙氧基苯氧并(14b)失败,从而导致了新的大环9。还尝试通过三氟乙酸脱保护中间的硫代保护的2-硝基苯基2-硫代苯基醚11a和c,然后环化所得的硫醇来获得2-氟-7-异丙氧基苯氧杂(14a)和2,8-二氟类似物14b 。不成功。用三氟乙酸对11a进行脱保护仅生成复杂的产物混合物,而对11c进行类似的脱保护