3-dibromo-2-(phenylthio)propene intermediate 7. Three uses of 2 as an annulating agent for cycloheptanone are illustrated, demonstrating that this reagent is a synthetic equivalent of acetonyl halide and an alpha-halo vinyllithium. It is also readily converted to the useful synthons 2,3-bis(phenylthio)propene 16 and 2-phenylthio-3-(phenylsulfonyl)propene 17.
[反应:参见正文]通过分离1,3-二
溴2的机理阐明,先用
溴处理烯丙基苯基
硫醚,再用
氢氧化钠水溶液处理,可得到2苯基
硫基-
3-溴丙烯2的良好收率。 -(苯
硫基)
丙烯中间体7.举例说明了2作为
环庚酮的成环剂的三种用途,表明该试剂是
丙酮酰卤和α-卤代
乙烯基锂的合成等价物。它也容易转化为有用的合成子2,3-双(苯
硫基)
丙烯16和2-苯
硫基-3-(苯磺酰基)
丙烯17。