A new approach to 2,2-disubstituted 1-(methylsulfanyl)vinyl phosphonates via an intermediate thiocarbonyl ylide
作者:Grzegorz Mlostoń、Katarzyna Urbaniak、Anthony Linden、Heinz Heimgartner
DOI:10.1016/j.tet.2009.07.074
日期:2009.9
methyl (diethylphosphoryl)dithioformate (6) with diaryldiazomethanes 7a–d in THF at −60 °C to room temperature followed by desulfurization is shown to be a convenient method for the preparation of 2,2-disubstituted 1-(methylsulfanyl)vinyl phosphonates 8a–d. The analogous reactions with 2-diazoacenaphthen-1-one (7f) or 2-diazocamphor (7g) in refluxing THF yield selectively the corresponding (Z)- and (E)-vinyl
在-60°C至室温下,(二乙基磷酰基)二硫代甲酸甲酯(6)与二芳基重氮甲烷7a – d在THF中反应至室温,然后进行脱硫反应,是制备2,2-二取代的1-(甲基硫烷基)的简便方法乙烯基膦酸酯8a – d。在回流的THF中与2-重氮ena -1-酮(7f)或2-重氮樟脑(7g)的类似反应分别选择性地产生相应的(Z)-和(E)-乙烯基膦酸酯8f和8g。这些产物很容易被氧化成乙烯基亚砜13和乙烯基砜14。另一方面,在沸腾的THF中,(二乙基磷酰基)二硫代甲酸甲酯(6)和2-重氮-1,2-二苯基乙酮(7e)反应生成1,3-氧杂硫醇12。所有这些反应通过中间体硫代羰基内酯11进行,然后进行1,3-偶极电环化和硫磺挤出或1,5-偶极电环化。