din‐3‐yl}methanones 2. In the second step, these were treated with LDA (LiNiPr2) to give 3‐aryl‐2,3‐dihydro‐2‐sulfanylthieno[2,3‐b]pyridin‐3‐ols 3, which were dehydrated in the last step with SOCl2 in the presence of pyridine to give the desired products. Similarly, thieno[2,3‐c]pyridine and thieno[3,2‐c]pyridine derivatives, 8 and 12, respectively, can be prepared from aryl(3‐chloropyridin‐4‐yl)methanones
已经开发了一种方便的三步程序,用于合成三种类型的3芳基2
硫烷基
噻吩并
吡啶4、8和12。
噻吩并[2,3- b ]
吡啶衍生物4的合成的第一步是用Na 2连续处理将芳基(2-卤代
吡啶-3--3-基)
甲烷1中的(磺酰基甲基)
硫烷基取代卤素。用S⋅9H 2 O和
氯甲基
硫化物制得芳基2-[[(
硫烷基甲基甲基)
硫烷基]
吡啶-3-基}甲酮2。在第二步中,将它们用
LDA(LiN i Pr 2)处理,得到3-芳基-2,3-二氢-2-磺酰苯并[2,3- b] pyridin-3-ols 3,最后一步在
吡啶存在下用SOCl 2脱
水,得到所需的产物。同样,
噻吩并[2,3- c ]
吡啶和
噻吩并[3,2- c ]
吡啶衍生物8和12可以分别由芳基(3-
氯吡啶-4-基)甲酮5和芳基(4-
氯吡啶-3-基)
甲烷9。